Abrupt Crossword Clue

 The answer to the crossword clue "Abrupt" can be CURT, TERSE, BLUNT, or BRISK.

CURT means rudely brief or to the point.

TERSE means concise and to the point.

BLUNT means lacking in subtlety or delicacy.

BRISK means quick and energetic.

These words can all be used to describe someone or something that is abrupt. For example, you could say that someone's tone was curt, or that their reply was terse.

The specific word that is used will depend on the context of the puzzle and the author's preference.