The opposite of an astute person is aa.liar.c.weakling.b.dimwit.

Astute means clever, perceptive, or quick to understand. A dimwit is someone who is not clever, so “dimwit” is the opposite of an astute person. A liar is dishonest, and a weakling lacks strength; neither is the opposite of astute.

AI-written and checked against the verified answer.