Shiddah, Tawassut, Rakhawah: Sifat of Sound Explained

Shiddah, rakhawah, and tawassut together form the second of tajweed's five paired sifat, and they are unusual among the five: instead of a clean two-way split like hams and jahr, this quality has a genuine middle category. Eight letters fully stop the air, sixteen let it flow freely, and five sit somewhere in between — neither fully stopped nor fully flowing.

This lesson continues directly from hams and jahr. Where that lesson gave you a clean either/or test, this one asks you to recognise a third possibility, which is exactly why the five tawassut letters cause more beginner trouble than almost any other single group of letters in tajweed.

By the end of this lesson, you will know all three groups by name and by list, be able to test any letter's airflow behaviour physically, and understand precisely why the five tawassut letters need deliberate, separate attention rather than being lumped in with one of the two extremes.

Shiddah (شِدَّة) is ordinary Arabic for "strength" or "intensity" — in tajweed, it describes a letter whose sound stops completely and suddenly, with the airflow fully blocked at the makhraj before release. Rakhawah (رَخَاوَة) means "softness" or "looseness" — the opposite behaviour, where air continues flowing freely for as long as you choose to sustain the letter. Tawassut (تَوَسُّط) simply means "being in the middle," and that is exactly its role: neither a full stop nor a free flow, but something genuinely between the two.

A useful way to picture this: shiddah letters behave like a closed door slamming shut, rakhawah letters behave like a door left wide open, and tawassut letters behave like a door held slightly ajar — air still moves, but only partially, and the exact amount takes practice to control.

This is not the same distinction as hams and jahr. Hams and jahr describe voicing — whether breath escapes audibly alongside the sound. Shiddah, rakhawah, and tawassut describe something different entirely: whether the airflow itself is blocked, free, or partial. A letter's position on one scale tells you nothing about its position on the other.

The simplest test for this sifah is the sustain test: try to hold the letter's sound for several seconds without stopping. A rakhawah letter, like س or ف, sustains easily and indefinitely — the sound simply continues as long as your breath lasts. A shiddah letter, like ب or ت, cannot be sustained at all; the moment of contact and release happens instantly, and there is nothing left to hold afterward.

Tawassut letters give a genuinely different result: try sustaining م or ن, and you will find you can hold them, but the sound feels weaker or more restrained than a true rakhawah letter, with the airflow only partially open rather than fully free. This partial, limited sustain is the physical signature of tawassut, and it is exactly why these five letters are easy to mistake for one extreme or the other.

Try the test now on three letters you already know well: ب (should stop instantly), س (should sustain freely), and م (should sustain, but with noticeably less openness than the س).

Classical tajweed remembers the eight shiddah letters through a short phrase:

أَجِدْ قَطٍّ بَكَتْ (ajid qattin bakat), roughly "I found a kitten crying."

Reading through the phrase gives you the complete list: ء ج د ق ط ب ك ت — hamzah, jeem, daal, qaf, taa-emphatic, baa, kaf, taa.

Several of these letters will already feel familiar from earlier lessons for a different reason: five of these eight — ق ط ب ج د — are also the qalqalah letters, the ones that bounce when sakin. This is not a coincidence: qalqalah can only happen to a letter whose airflow is fully stopped in the first place, which means every qalqalah letter must be shiddah. Not every shiddah letter is qalqalah, though — hamzah, kaf, and taa are shiddah without the bounce.

Notice too that shiddah says nothing about heaviness or voicing on its own — this list mixes heavy letters (qaf, taa-emphatic) with light ones, and voiced letters (jeem, daal, baa) with unvoiced ones (kaf, taa). Shiddah is strictly about airflow, independent of every other sifah.

Rakhawah makes up the largest of the three groups: sixteen letters in total, more than half the alphabet. Rather than memorising a mnemonic phrase, the easiest way to hold this list in mind is by exclusion — once you know the eight shiddah letters and the five tawassut letters, everything else is automatically rakhawah.

The sixteen rakhawah letters are: ث ح خ ذ ز س ش ص ض ظ غ ف هـ و ي, plus the pure madd letter ا (alif), which has no fixed stopping point at all and therefore represents the most completely open airflow in the entire alphabet.

Notice that rakhawah, like shiddah, tells you nothing about a letter's other qualities on its own: this list includes both hams letters (thaa, haa, kha, seen, sheen, saad, faa, the soft ha) and jahr letters (dhaal, zay, dad, zha, ghayn, waw, ya, alif), and both heavy letters (kha, saad, dad, zha, ghayn) and light ones. Airflow, voicing, and weight are three genuinely separate scales, and rakhawah only answers the airflow question.

Five letters sit genuinely between shiddah and rakhawah, remembered by the short phrase لَنْ عُمَر (lan 'umar): ل ن ع م ر — laam, noon, 'ain, meem, raa. These five have already appeared across earlier lessons — laam's lateral spread, noon and meem's ghunnah, 'ain's throat constriction, and raa's trilling all involve air moving in a partial, controlled way rather than stopping completely or flowing entirely freely.

This is exactly why tawassut letters are the group beginners mispronounce most often. Faced with a letter that is neither a clean stop nor a clean continuous flow, learners tend to default to whichever extreme feels more familiar — either cutting a tawassut letter off too abruptly, like a shiddah letter, or letting it flow too freely, like a rakhawah letter. Both mistakes lose the genuinely partial quality that defines this middle group.

One word gives you a remarkably efficient drill for this entire group: الرَّحْمَٰنِ (ar-rahman, "the Most Merciful," Al-Fatihah 1:1) contains four of the five tawassut letters — ر, م, ن, and ل — inside a single word.

A useful comparison sits inside letters you already know from the same makhraj neighbourhood: jeem (ج) is shiddah, a full stop; its close neighbour sheen (ش) is rakhawah, flowing freely with its distinctive tafashi spread. Both come from wasat al-lisan, yet one stops completely and the other never does.

A second useful comparison is noon (ن), tawassut, against daal (د), shiddah, and zay (ز), rakhawah — three genuinely different airflow behaviours from three different makharij, useful for training your ear to recognise all three categories independently of where in the mouth a letter is produced.

The recurring mistake across all of these comparisons is assuming that letters from a similar region of the mouth must share similar airflow behaviour. They frequently do not — shiddah, rakhawah, and tawassut are determined by what happens at the point of contact, not by which general zone that point belongs to.

You already saw in Step 4 that qalqalah requires shiddah — the bounce only happens because the airflow was fully stopped in the first place, and then suddenly released. But the two systems are not identical: qalqalah applies to only five of the eight shiddah letters (ق ط ب ج د), while hamzah, kaf, and taa remain shiddah without ever bouncing. For the complete rule, including how strong the bounce should be and where it matters most, see our dedicated lesson on the qalqalah letters.

This lesson also completes the second of tajweed's five paired sifat. The next pair — isti'la and istifal, heaviness and lightness, alongside itbaq and infitah — continues directly from here, and several letters you have already met in this lesson, like taa-emphatic and saad, will reappear with a new quality attached. See our lesson on isti'la, istifal, and itbaq when you are ready to continue.

Each paired sifah adds one more independent layer to a letter's full profile — airflow, from this lesson, sits alongside voicing, weight, and the others, all at once, on every single letter you read.

Shiddah, rakhawah, and tawassut hold steady regardless of vowel, but each group demands a different kind of attention during recitation. Shiddah letters need a clean, complete stop even when reciting quickly — rushing tends to soften the stop into something closer to tawassut. Rakhawah letters need their airflow sustained for their full natural duration, not cut short. Tawassut letters need the most deliberate control of all: neither stopped early nor allowed to flow too freely.

Surah Al-Fatihah gives you all three groups clearly: الدِّينِ (ad-deen, "the [Day of] Judgement," 1:4) carries the shiddah letter د; الرَّحِيمِ (ar-raheem, "the Especially Merciful," 1:1) carries the rakhawah letter ح; and نَعْبُدُ (na'budu, "we worship," 1:5) carries two tawassut letters back to back, ن and ع, alongside the shiddah letters ب and د in the very same short word.

Na'budu is worth reading slowly on its own: four letters, two different airflow categories, all in one common word you likely already know well.

Recite both mnemonic phrases — ajid qattin bakat for shiddah, lan 'umar for tawassut — until they come automatically, then apply the sustain test to five or six random letters, predicting the category before you test yourself. Anything not in either phrase is rakhawah by default.

For listening, revisit jeem versus sheen and noon versus daal from Step 7, focusing only on how long the sound can be sustained, not on any other quality. Then read na'budu slowly, feeling the switch between tawassut and shiddah within a single short word.

Quick review: eight shiddah letters (full stop), sixteen rakhawah letters (free flow, the largest group), and five tawassut letters (genuinely in between, and the hardest to get right). Airflow is one full, independent layer of every letter's identity, alongside hams/jahr and the pairs still ahead. The fastest way to know your own airflow control is accurate is to have a trained ear check you directly. Book a free evaluation and a Waraqa teacher will listen for shiddah, rakhawah, and tawassut across a full range of letters with you.