Negating Property Predicates with ไม่

Thai negates an ordinary property predicate by putting ไม่ immediately before it: ห้องไม่ใหญ่ “the room is not large,” อาหารไม่เผ็ด “the food is not spicy.” There is no copula to negate and no equivalent of English do: the property is already the predicate, and ไม่ supplies negative polarity.

Other words around ไม่ refine the meaning. ไม่ค่อยเผ็ด is “not very spicy,” ยังไม่ร้อน is “not hot yet,” and ไม่ร้อนแล้ว is “no longer hot.” Their order is not decorative; it determines which part of the state is denied and how that state relates to time.

Plain property negation

The neutral frame is subject/topic + ไม่ + property. The subject can be omitted when both speakers know it.

Thai does not change ใหญ่, แพง, or ร้อน for negation, tense, person, or number. A time phrase such as วันนี้ provides temporal reference; the predicate remains invariant.

Not very and not at all

Plain ไม่แพง denies “expensive.” ไม่แพงมาก places มาก inside what is denied and normally means “not very expensive”; it does not necessarily claim that the item is cheap. ไม่ค่อยแพง is a common neutral way to say “not particularly expensive.” To strengthen a complete denial, use ไม่...เลย “not at all.”

The placement of มาก after the property follows the positive pattern แพงมาก. When ไม่ precedes that whole degree phrase, the reading is “not [very expensive].” By contrast, ไม่...เลย reinforces the negative as a whole.

Not yet versus no longer

ยังไม่ + property means that the expected state has not been reached yet. ไม่ + property + แล้ว means that a previously relevant state no longer holds. Reversing the temporal viewpoint changes the message.

These particles do not conjugate ร้อน or อุ่น. They independently locate the unchanged property relative to an expected transition. The difference is developed further on the change-of-state page.

Property denial versus denied identity

English uses is not before both adjectives and nouns. Thai chooses by predicate type:

The ไม่ใช่ page treats identity in detail. Do not memorize one Thai translation for English not be; identify the predicate category first.

Negating comparisons and superlatives

ไม่ can scope over a larger property phrase. ไม่ใหญ่กว่าห้องนั้น denies “larger than that room”; it allows equality or smaller size. It does not itself mean “smaller.” Likewise, ไม่แพงที่สุด means “not the most expensive,” not automatically “the cheapest.”

When a correction rejects someone else's assumption, ไม่ได้ + property can occur as a marked corrective denial: ไม่ได้แพงขนาดนั้น “It isn't actually that expensive.” This is more emphatic and discourse-sensitive than neutral ไม่แพง; learners should not replace every plain ไม่ with ไม่ได้.

Negative property modifiers

A compact noun phrase such as อาหารไม่เผ็ด “non-spicy food” is common in requests. For a longer or contrastive description, noun + ที่ + negative predicate is clearer.

Here ที่ introduces the whole negative property phrase ไม่แพงมาก. It is not an English article and it does not create a special adjective form.

Ordinary-polite dialogue

Thai commonly answers by repeating the relevant predicate with or without ไม่. The reply does not need an English-style “it is,” and the omitted room remains recoverable.

Common Mistakes

1. Putting ไม่ after the property

2. Adding เป็น because English has “is not”

3. Using ไม่ใช่ before a property

4. Confusing not yet with no longer

5. Treating “not larger” as “smaller”

Key Takeaways

Place ไม่ before a property predicate. Use ไม่ค่อย... or ไม่...มาก for “not very,” ไม่...เลย for “not at all,” ยังไม่... for “not yet,” and ไม่...แล้ว for “no longer.” Distinguish property negation from ไม่ใช่ with identity nouns and ไม่มี with absence, and remember that negating a comparative does not assert its opposite.