How do you say "thank you" in Thai?

"ขอบคุณ" (khob khun) is the correct way to say "thank you" in Thai. This phrase is commonly used in everyday interactions when expressing gratitude. The roots of the expression are found in the words "ขอบ" meaning "to thank," and "คุณ" meaning "you" or "your kindness." Together they convey appreciation towards someone else's actions or generosity.

The other options represent different Thai phrases. "สวัสดี" (sawasdee) is a common greeting, equivalent to "hello." "กรุณา" (karuna) translates to "please," implying a request for kindness or consideration. "ไม่" (mai) simply means "no" or "not," serving as a negation in conversation. Thus, while these phrases are useful in various contexts, they do not convey the sentiment of gratitude that "ขอบคุณ" does.