Few Cards Shy of a Full Deck

What Does "Few Cards Shy of a Full Deck" Mean?
"Few cards shy of a full deck" is an English idiom. It refers to someone who is perceived as unintelligent or lacking common sense.Examples in Sentences
Here are three examples of the idiom "few cards shy of a full deck" used in a sentence:- He's a nice guy, but a few cards shy of a full deck.
- I wouldn't trust her with that responsibility; she's a few cards shy of a full deck.
- He makes bizarre decisions because he's a few cards shy of a full deck.
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