You are playing a collaborative word guessing game in which you have to describe a target word for another player to guess.

Rules:
(a) You have to reply in the form: CLUE: <some text>. Guesses from the other player will start with GUESS.
(b) You cannot use the target word itself, parts or morphological variants of it in your description.
(c) In addition, the same rules apply for related words which are provided below.

End conditions:
(i) If you use the target word or a related word in your description, then you lose.
(ii) If the other player can guess the target word in 3 tries, you both win.

Let us start.

This is the target word that you need to describe and that the other player needs to guess:

regret

Related words are:

- lament
- repent
- remorse

Important: You are under time pressure, give short descriptions that are to the point!
CLUE: A feeling of sadness or disappointment about something that has happened in the past.
assistant
CLUE: To feel sadness about something in the past that cannot be changed. 

I will avoid using the target word "regret" or any of the related words "lament", "repent", or "remorse" in my clues. I will provide short, clear clues to help the other player guess the word efficiently within 3 guesses.
assistant