foolish; silly:that damn fool waiter
1a person who acts unwisely or imprudently; a silly person:I felt a bit of a fool archaic a person who is duped or imposed on:he is the fool of circumstances
2 historical a jester or clown, especially one retained in a royal or noble household. 1 [with object] trick or deceive (someone); dupe:don’t be fooled into paying out any more of your hard-earned cash she tried to fool herself that she had stopped loving him
2 [no object] act in a joking, frivolous, or teasing way:some lads in the pool were fooling around [no object]
) chiefly North American engage in casual or extramarital sexual activity.