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3. with a screw loose

with a screw loose

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with a screw loose

Having or characterized by silliness, eccentricity, craziness, or mental instability. There's some guy with a screw loose standing on the corner yelling obscenities at passersby. I have this strange fear that I'm going to turn into a lonely old bachelor with a screw loose when I get old.

See also: loose, screw