That's enough, never mind: Thôi!

Thôi at the start of a sentence, or on its own, closes something down: "that's enough", "no thanks", "never mind" or "right, that's it". It looks back at what has just happened and draws a line under it.

To stop someone: Thôi! Stop it! or Thôi, đủ rồi. That's enough. Parents comfort a crying child with Thôi, nín đi con. There now, stop crying.

To turn down an offer gently: Thôi, em no rồi. No thanks, I'm full. Thôi khỏi is "no need, don't bother".

To give up on something: Thôi, bỏ đi. Never mind, forget it. And Thôi được is "oh, all right then", when you give in.

To wrap up and move on, often when leaving: Thôi, trễ rồi, em về nha. Right, it's late, I'm off (in Hà Nội, muộn rồi … nhé).

The same word at the end of a sentence means "only": Em uống cà phê thôi, I only drink coffee. At the start it's "enough"; at the end, "only".