Definition of have a screw loose in English:

have a screw loose

phrase

informal
  • Be slightly eccentric or mentally disturbed.

    ‘I think I must have a screw loose—I can't care about what might happen next’
    • ‘She looked at her sister like she had a screw loose.’
    • ‘The first sign Backman had a screw loose was when he said at his introductory news conference that he intended to win immediately.’
    • ‘People often say that it's harder to get out of the team that into it, but whoever believes that has a screw loose.’
    • ‘Some of my people have speculated about such things for a long time, but now it is official: it has been medically, clinically diagnosed that I have a screw loose.’
    • ‘Most people didn't think he had an actor's profile; they thought he had a screw loose.’
    • ‘There was a moment when I allowed myself to entertain the notion that maybe I was right after all, and the rest of the world had a screw loose.’
    • ‘Man, you have a screw loose in that head of yours!’
    • ‘Who could not think he has a screw loose after going on about seeing the devil on the stage?’
    • ‘So, filled with a hubris limited to those with more than a couple screws loose, he offs him.’
    • ‘My school friends had thought I had a screw loose when I stopped to stare, head cocked to the side, curiosity raging when the moving truck had first arrived.’
    unstable, unbalanced, of unsound mind, mentally ill, deranged, demented, crazed, troubled, disturbed, unhinged, insane, mad, mad as a hatter, mad as a march hare, raving mad, out of one's mind, not in one's right mind, neurotic, psychotic
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