booby
n.n. a person who is very foolish or silly. You use this word to describe someone who makes bad decisions or acts in a way that shows they are not smart.
n. a person who is foolish, gullible, or lacking in common sense. Often used to describe someone who is easily tricked or behaves in a socially awkward manner.
He is such a booby that he fell for the simplest scam.
The old man was a complete booby, believing every story the con artist told him about the lottery.
In the classic novel, the protagonist is portrayed as a booby who fails to recognize the subtle manipulations of his more cunning rivals, leading to his eventual downfall.
17th century. From Spanish bobo, from Latin balbus (“stammering”). (bird): Compare typologically Translingual Morus, German Tölpel, Polish głuptak (akin to głupek), Russian о́луша (óluša) (akin to о́лух (ólux)).
From the earlier form bubby.
From boob + -y.