not mentally sound
stupid, dimwitted
crazy or mentally deranged
not very intelligent or bright
mentally deficient
With the number of silly remarks he comes up with, I wonder if he’s not playing with a full deck.
He may be an influential person, but some of the things he does gives the impression that he is not playing with a full deck.
He keeps talking to himself. I think he’s not playing with a full deck.
That scientist is considered to be a genius in his field, but with some of the antics he’s up to at the university, it looks like he’s not playing with a full deck.
The new teacher doesn’t seem to know what he’s teaching. He’s not playing with a full deck.
He is a nice person, but with some of the foolish things he does, I think he’s not playing with a full deck.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.