(one) is not playing with a full deck

(one) is not playing with a full deck

1. One is not mentally sound; one is crazy or mentally deranged. A: "Look at that guy talking to himself on the corner." B: "I reckon he's not playing with a full deck."
2. One is not very bright or intelligent. Jim's a nice guy, but with some of the foolish things he does, I wonder if he's not playing with a full deck.
See also: deck, full, not, play
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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