I understand why you ask the question, but a comma is seldom placed there. The expression no thank you is so common that it is treated as a conjoined idiom. The only time a comma would be necessary, would be if the author wished to indicate a specific pause.
Strictly speaking "No thanks" would mean the person is not giving you any thanks. With a comma, "No, thanks", means "No, but thank you anyway" or similar.
"No thanks" is commonly said without any hint of a pause, and thus there is no need for the comma, in most uses. There is little danger of it being misinterpreted in a reasonable context. "No, thank you", on the other hand, is probably more appropriate with the comma there is generally a hint of a pause after "no".
Thanks, but no, I refuse the offer; thank you once again. Indeed, without the first "thanks", there is formally a comma in "No, thanks" or "no, thank you". Why exactly is the comma omitted here? What grammar rule is applied, or is it an exception? Are there any other common examples where a logically required comma can be omitted?
One of the recommended methods for bypassing Microsoft account login during the Windows 11 OOBE is to attempt to log in using a locked account (no @thankyou being the most commonly recommended account to use).
Update: Thank you all for the overwhelming response! After 13 answers, I feel I got a better understanding of the phrase. I'm grateful for @Andrews answer, because he took the cultural aspect into consideration. This was the decisive part that I missed. I can also understand @MT_ Head that saying No thank you, I'm full while smiling isn't offensive at all. Thanks for that. I conclude that ...
It's because you are actually saying "No, thank you," to which your friend is responding, "You're welcome." You could have just said "No" and be done with it, but you added "thank you," which your friend chooses to respond to. Get it?
2 No thanks is used to decline an offer from somebody. 'Do you want tea?' 'No thanks.' No need to say thanks is used when someone thanks you for doing something. So the two are not interchangeable in the context you provided.
The shortened reply "Thanks" can have any of the meanings of the fully written statements "Thank you", "No, thank you", or "Yes, thank you". "Thanks" could also mean a doubly intended "Yes, but not really" or a brisk "No" simply depending on whether it is said with a sarcastic or negative tone in your voice.
To me, responding "no problem" to "thank you" implies there might have been a problem, which was somehow narrowly averted. Are there specific situations in which "no problem" is appropriate to use as a substitute for "you're welcome"?
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