Definition of not right in the head in US English:

not right in the head

phrase

informal
  • (of a person) not completely sane.

    • ‘Someone needs to lock that woman up, because she's not right in the head if she thinks that looks good.’
    • ‘‘They say how they're not right in the head,’ said Willis.’
    • ‘He said his sister was not right in the head, and had gone crazy and carried out the killings.’
    • ‘‘Maybe he's not right in the head,’ he muttered, more to convince himself than Adam or his brothers.’
    • ‘He tells himself he has no business being in his position if he is not right in the head.’
    • ‘‘People are going to think I'm not right in the head,’ he protested, following after her.’
    • ‘I swear Claire's not right in the head sometimes.’
    • ‘He hangs around with Ben and Anthony though, so maybe he's not right in the head.’
    • ‘‘He's not right in the head,’ one onlooker was heard to say as Kiwi pilot, Steve Taylor's Edge 540 aerobatic plane twirled and dived overhead like a demented moth.’
    • ‘You have just proved you're not right in the head.’
    sane, in one's right mind, of sound mind, in possession of all one's faculties, able to reason clearly, able to think clearly, lucid, rational, coherent, balanced, well balanced
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