Thai Silent Letters: The Mark That Switches a Letter Off
TL;DR: The small mark ์ sitting on top of a Thai consonant means that letter is not pronounced. It is called ทัณฑฆาต, and a letter wearing it is การันต์. It almost always lands on the last letter of a word, and it usually takes the letter before it down as well: จันทร์ is read jan, not jan-thra. Switching a letter off promotes whatever comes before it to the end of the syllable, which changes the tone — so the mark does more than delete a sound.
The letters that are there and are not said
You get through the consonants, you get through the vowels, and then a bus goes past with รถเมล์ on the side. That is five letters and a mark you have never been shown, and the word is two syllables: rót-mee. The ล at the end contributes nothing at all.
What is doing that is the little mark above it. It is written ์, it is called ทัณฑฆาต, thanthakhat, and a letter wearing one is การันต์, karan — which is the word most people use for the mark itself as well. Its whole job is to say: this letter is spelled, and it is not spoken.
Once you can see it, a large slice of the writing that beat you starts to give way, because it is nearly always the piece that made a word look longer and stranger than it sounds.
How far back the silence goes
The mark silences the letter beneath it. The part that catches people out is that the silence often reaches one letter further back: if the consonant immediately before it has no vowel of its own, that one usually goes quiet too.
| Word | Said as | Means | What goes quiet |
|---|---|---|---|
| สัตว์ | sàt | animal | ว only |
| ศุกร์ | sùk | Friday | ร only |
| อาทิตย์ | aa-thít | Sunday | ย only |
| จันทร์ | jan | Monday, moon | ท and ร |
| รถเมล์ | rót-mee | bus | ล only |
จันทร์ is the one worth staring at. ท and ร are sitting there with no vowel between them and no vowel after them, and the mark is on the ร. Both are switched off, and the word ends at the น. Read it as jan and you are right; read every letter you can see and you get jan-thon or jan-thra, which is a word nobody says.
Why it changes the tone as well as the sound
This is the part that makes the mark worth a page of its own rather than a footnote. Silencing the last letter does not just remove a sound from the end of the word. It hands the job of closing the syllable to whatever was in front — and how a syllable closes is one of the three things that decide its tone.
Take ศุกร์, Friday. Four letters: ศ, the short vowel ุ, then ก, then ร under the mark. With the ร switched off, ก is the final. A syllable that ends in a k sound is dead, ศ is a high-class letter, and a dead syllable on a high-class letter with no tone mark is low. So sùk — low tone, and you got there from the class of the first letter and the ending that the silencing mark handed you.
สัตว์ works the same way: ว goes quiet, ต becomes the final, a t ending is dead, ส is high class, so the word is low — sàt. And จันทร์ goes the other way, because น is a nasal: the syllable is live, จ is mid class, and a live mid-class syllable with no mark is mid tone — a flat, unremarkable jan.
So the reading order is: find the mark, cross out what it silences, then look at what is now the last letter and run the tone rule on that. Doing it the other way round — reading the tone off the letter you can see at the end — gives the wrong answer every time.
Why a language would spell letters it refuses to say
Because the spelling came from somewhere else and Thai decided to keep it. Sanskrit and Pali arrived with consonant clusters at the ends of words that Thai does not pronounce, and rather than respell them, Thai wrote them out in full and marked the unpronounced part. ศุกร์ is shukra with the r turned off. จันทร์ is chandra, the moon, with the last two letters turned off. The etymology is preserved on the page and thrown away in the mouth.
The same machinery then got pointed at English, which is where it becomes genuinely useful to a beginner. A karan in a modern word is a fairly reliable sign that the word is borrowed, and borrowed usually means you already know it:
| Written | Said as | Borrowed from |
|---|---|---|
| เบียร์ | bia | beer |
| ฟิล์ม | fim | film |
| แสตมป์ | sà-tɛɛm | stamp |
| ยีนส์ | yiin | jeans |
| คอมพิวเตอร์ | khom-phiu-tə̂ə | computer |
Every one of those drops a final consonant English pronounces and Thai does not — the m of film survives, the l does not; the p of stamp is written and silent. If you decode a word, find a karan in it, and the result sounds nearly like an English word, it almost certainly is one. That is a shortcut worth having on a menu.
A full stop, in a language with no spaces
There is a second, quieter use for the mark. A karan sits at the end of a word and nowhere else — it will never be on the first letter of a syllable, and you will not find one in the middle of a word with more word after it. In a script that writes no spaces between words, that makes it one of the few visible boundary markers you get for free.
So when a line of Thai runs together and you cannot find the seams, scan it for the small circles sitting above the baseline. Each one is the end of something. It is not many boundaries, but on a sign or a bus it is often the one you needed.
The days of the week are where most learners meet all of this at once, since four of the seven carry a karan — the seven day names, decoded walks through them one letter at a time. If you have not met the consonant classes yet, the alphabet chart grouped by class is the piece the tone half of this page depends on.
Phayan is an app for learning to read Thai script, working letter by letter from zero with audio on every word and progress kept without an account. Its free levels run from the five tones through first words, more vowels, finals and syllable types, and the mid-class letters with their tone marks — which is the core reading system this mark sits on top of rather than inside.
Frequently asked questions
What is the best way to learn Thai silent letters?
Learn to read the syllable first and treat the silencing mark as a step you apply afterwards, because it is a rule about spelling rather than a sound to memorise. Once you can find the initial, the vowel and the final in an ordinary word, adding “and cross out anything under a ทัณฑฆาต” takes about a minute. Phayan works letter by letter through the core system the rule operates on, with audio on every word; a flashcard deck of karan words can drill the specific words afterwards, but it will not teach you which letter becomes the new final.
How do I know if a Thai letter is silent?
Look for the small mark directly above it: ์ means the letter beneath makes no sound. Check the letter immediately before it too, because if that one has no vowel of its own it is usually silent as well, which is why จันทร์ is jan rather than jan-thon. Nothing else in Thai looks quite like it — a tone mark sits in the same place but is a stroke or a small figure rather than a closed loop, and it changes the tone instead of removing a sound.
Is it safe to just ignore the letters under a karan?
For pronunciation, yes — that is exactly what the mark is telling you to do. For the tone, no, because dropping the last letter changes which letter closes the syllable, and that is one of the inputs to the tone rule. ศุกร์ is low tone because ก, not ร, is doing the closing. Ignore the silenced letters when you speak and pay attention to them when you work out how the word should sound.
What is the difference between ทัณฑฆาต and การันต์?
ทัณฑฆาต is the name of the mark itself, and การันต์ is the name for a letter that is wearing one — strictly, the silenced letter rather than the symbol. In everyday Thai the two blur together and most people will say การันต์ when they mean the mark, so you will hear both used for the same thing. Neither name matters for reading; recognising the shape does.
Why does Thai bother writing a letter it does not say?
Because the word came in from Sanskrit, Pali or English and Thai kept the original spelling rather than rewriting it, marking the part it does not pronounce. It costs a reader a rule and buys the language a visible record of where its words came from, which is the same bargain English makes with the b in doubt. The practical upside is that a karan in a modern word is a decent hint that it is borrowed, so คอมพิวเตอร์ and แสตมป์ are easier than they look.