r/learnthai • u/Responsible-Yam-4887 • Jan 29 '26

Grammar/ไวยากรณ์ Explain เหตุ silent vowel

Hi. Ive seen several times this sort of word. Why is the second vowel not pronounced?

I see Hethu. But it is pronounced like Het. Why?

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u/porkbacon Jan 29 '26

When I see ติ or ตุ somewhere where ต could otherwise be a final consonant, I just assume the vowel isn't pronounced. It depends on the word but it's a fairly common pattern https://thai-notes.com/reading/lesson37.html

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u/trevorkafka Jan 29 '26

It's a bit odd that they count ย as a silent letter, imo. In these cases, ย is always paired with ไ, so I think the better way to think about it is for ไ-ย to be regarded as its own vowel symbol combination.

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u/BangkokTraveler Jan 30 '26

I've noticed that also.

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u/Responsible-Yam-4887 Jan 29 '26

I didnt know about ติ has the same rule. Good to know.

I have been watching the news a lot and เหตุ comes up frequently, + Ive seen this pattern elsewhere in the past.

Of course English has many silent vowels that make no sense and Thai seems to be much more consistent with spelling and pronunciation rules.

Anyway, I still wonder why the vowel should be included at all if it is just pronounced as ต. There is surely a reason, even if it some ancient rule lost to time.