Thangaith has an unusual phonology resulting from distinctive sound changes, the most visible being lenition of unvoiced stops and the subsequent devoicing of voiced stops.

/p t ʈ k/ <p d r k>
/b ɡ/ <b c>
/m n ɳ ɲ ŋ/ <m n z j g>
/β θ s ɕ h/ <w t s x h>
/j/ <y>

/i e a ɔ ʊ ɨ ə o u/ + length <i e a o u í é ó ú> <VV>

/á à/ <a à> <ô>

Geminated consonants often occur in the onset of stressed syllables. The long equivalents of /β θ s ɕ/ are [bβ tθ ts tɕ] <bw dt ds xx>.
The retroflexes occur only in numerous Poneamndrieng and Mhra loans.