What is the Thai word for "no"?

The Thai word for "no" is correctly identified as "ไม่" (mai). In the Thai language, this term is a fundamental negation word used to respond negatively to questions or statements. It is an essential part of daily conversation, allowing speakers to convey disagreement or refusal clearly.

The other choices provided represent different words: "ใช่" (chai) means "yes," "ขอบคุณ" (khob khun) translates to "thank you," and "น้ำ" (nam) means "water." These terms, while important in the Thai language, serve other purposes and are not applicable when expressing negation. Understanding these distinctions is crucial for effectively communicating in Thai, especially in situations where clarity in agreement or disagreement is needed.