not have all (one's) marbles

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not have all (one's) marbles

To not be completely mentally sound or stable. After he started bringing conspiracy theories into the conversation, I started wondering if maybe he didn't have all his marbles. It's easy to feel like you don't have all your marbles when you're that sleep deprived.
See also: all, have, marble, not
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

not have all one's marbles

Fig. not to have all one's mental capacities. John acts as if he doesn't have all his marbles. I'm afraid that I don't have all my marbles all the time.
See also: all, have, marble, not
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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