I assume the first syllable in the words below would have the same tone.

สนุก

สมุด

สมุทร

สะพาน

สะอาด

What tone is it supposed to be?

How low can you go?

thai-language.com. I found a list of 3000 words from this page and am going through them matching them with thailanguage.com

On 7/18/2026 at 4:28 AM, ColeBOzbourne said:

How low can you go?

Unbelievable.

I can't understand how I went several years without realizing that.

Take a word like ขมิ้น

So the first syllable ขะ has a low tone.

And the second syllable has a falling tone, because it assumes the อักษรสูง traits of the first syllable.

Is this how it goes for most/all such words with this type of construction?

Now let's look at the word ลักษณะ

The first syllable ลัก is high tone.

The second syllable ษะ is low tone.

And the third syllable ณะ is also low tone, right? It assumes the อักษรสูง traits of the immediately preceding syllable, correct?

On 7/20/2026 at 2:55 PM, BananaBandit said:

Unbelievable.

I can't understand how I went several years without realizing that.

Take a word like ขมิ้น

So the first syllable ขะ has a low tone.

And the second syllable has a falling tone, because it assumes the อักษรสูง traits of the first syllable.

Is this how it goes for most/all such words with this type of construction?

Now let's look at the word ลักษณะ

The first syllable ลัก is high tone.

The second syllable ษะ is low tone.

And the third syllable ณะ is also low tone, right? It assumes the อักษรสูง traits of the immediately preceding syllable, correct?

I was hoping someone else would chime in that knows about this rule, because I don't. I have noticed this type of construction now and then, but didn't know it was that way in every case. Somehow I had the impression it was originally done to make the word/syllables/tones roll off the tongue easier. Several short syllables in a row, with the tone jumping back and forth from high to low, might cause your speech to stumble. I'm probably wrong.

I've had Spanish teachers tell me certain words do not follow the rules, or have special rules, so they roll off the tongue easier, and/or are more pleasant to the ear. I would like to know more about the rule in Thai. Here's Google's take on what I'm trying to explain:

To "flow off the tongue"—more commonly said as "roll off the tongue" or "trip off the tongue"—means that a word, name, or phrase is very easy, smooth, and pleasant to say.

Meaning and Use

• Easy to say: The sounds fit well together in the mouth.

• No stumbling: You do not trip or get stuck on hard consonants.

• Common variants: People also say "roll off the tongue" or "trip off the tongue".

A bit more from google. I asked if any Thai tones are changed to make words roll off the tongue easier. The following relates to how native speakers change words, rather than proper rules of grammar. I believe the bullet titled "Speech Assimilation" is most relevant to our conversation.

**Yes, native speakers naturally modify tones in fast, casual speech to make sentences flow easier. This includes sandhi-like pitch adjustments, shortening contours, and vowel reduction.

Natural Speech Adjustments

• Pitch assimilation: Tones often bend to match the surrounding syllables, smoothing out sharp jumps between high and low pitches.

• Contour flattening: Complex rising or falling tones can become shorter or more level when spoken quickly in everyday conversation.

• Reduced unstressed syllables: Introductory or filler words lose their distinct tonal prominence, drifting into a relaxed mid-low pitch.

6 hours ago, ColeBOzbourne said:

I was hoping someone else would chime in that knows about this rule, because I don't. I have noticed this type of construction now and then, but didn't know it was that way in every case. Somehow I had the impression it was originally done to make the word/syllables/tones roll off the tongue easier. Several short syllables in a row, with the tone jumping back and forth from high to low, might cause your speech to stumble. I'm probably wrong.

I've had Spanish teachers tell me certain words do not follow the rules, or have special rules, so they roll off the tongue easier, and/or are more pleasant to the ear. I would like to know more about the rule in Thai. Here's Google's take on what I'm trying to explain:

To "flow off the tongue"—more commonly said as "roll off the tongue" or "trip off the tongue"—means that a word, name, or phrase is very easy, smooth, and pleasant to say.

Meaning and Use

• Easy to say: The sounds fit well together in the mouth.

• No stumbling: You do not trip or get stuck on hard consonants.

• Common variants: People also say "roll off the tongue" or "trip off the tongue".

In the past week-plus, I can recall identifying 4 exceptions (am virtually certain there are quite a few more):

สะพาน

สบาย

แสดง

เสบียง

In each of the words above, the second syllable has a mid tone, even though the first syllable is a สะ

10 hours ago, BananaBandit said:

In the past week-plus, I can recall identifying 4 exceptions (am virtually certain there are quite a few more):

สะพาน

สบาย

แสดง

เสบียง

In each of the words above, the second syllable has a mid tone, even though the first syllable is a สะ

I believe it is the second consonant that you have to focus on? The consonant clusters above are broken, not smooth. That means that the first consonant has the “a” vowel inserted. For example, สบาย, becomes sà-baai. So you have a falling tone followed by a mid tone. Why? It is because these particular broken clusters are “flat”, not “musical”. The s and b sound together cannot be hummed, therefore flat. The rules dictate that for broken flat clusters each consonant determines its own tone in the syllable.

So short vowel and high class ส becomes sà and long vowel and mid class บ becomes mid tone baai.

Compare that with a broken cluster that is musical, ขนม, kà-nǒm. With broken musical clusters the leading consonant determines the tone for both syllables.

So short vowel and high class ข becomes kà and the second syllable is nǒm because the first consonant was high class, and a live syllable is “rising tone”.

This issue revolves around the two types of broken clusters and the rules that are applied to each.

I assume the first syllable in the words below would have the same tone.

You assume incorrectly.

The proper tone is whatever Thai people say it is.

I learned that in my first year of Thai class.

And it's pronunciation is whatever Thai people say it is.

For example when Thai people say "Mae dai" instead of "Mai dai"

So instead of saying "I can't" they say "Mother can"

Cute, huh? 😄

Edited August 3Aug 3 by SiSePuede419
Can't

13 minutes ago, SiSePuede419 said:

I assume the first syllable in the words below would have the same tone.

You assume incorrectly.

The proper tone is whatever Thai people say it is.

I learned that in my first year of Thai class.

And it's pronunciation is whatever Thai people say it is.

For example when Thai people say "Mae dai" instead of "Mai dai"

So instead of saying "I can't" they say "Mother can"

Cute, huh? 😄

To be frank, the rules determine these particular tones. There is a logical explanation for them.

There are many exceptions in Thai, where the rules do not apply, like loan words, but the original question can be answered using the rules that govern consonant clusters.

1 hour ago, AlexRich said:

There are many exceptions in Thai, where the rules do not apply

Yeah, that's what I said. 😄

So "Mai" is a loan word, or is that another exception to your "rule" that there are no exceptions, except loan words ❓

Edited August 3Aug 3 by SiSePuede419
"Mai" is a loan word?!?

6 hours ago, SiSePuede419 said:

Yeah, that's what I said. 😄

So "Mai" is a loan word, or is that another exception to your "rule" that there are no exceptions, except loan words ❓

Back to the original question? It can be explained by the grammar rules. My point.

That Thai’s use colloquial language in real life, and may not speak grammatically correct, like a Thai newsreader? Your point.

But the original question is about grammar rules … not everyday use of the language, which differs according to where you are and social class. Two different issues.

1 hour ago, AlexRich said:

Back to the original question? It can be explained by the grammar rules.

Can you provide the grammar rule and its source, or maybe a link so we can read the rule? I've never come across an actual rule covering this specific topic in any of my books.

49 minutes ago, ColeBOzbourne said:

Can you provide the grammar rule and its source, or maybe a link so we can read the rule? I've never come across an actual rule covering this specific topic in any of my books.

You can find it in the Read Thai in 10 Days book, but they do not use the terminology musical and flat for broken consonant clusters. That term came from a Udemy course called something like Learn Thai from an American Guy. I would recommend both.

My main point was that these examples are not anomalies or irregular words, the tones applied are based on rules.

There are irregular tones in Thai. The first syllable of these words tend to start with bprà and am. So they do exist, just not in these cases.