Definition of not right in the head in US English:

not right in the head

phrase

informal
  • (of a person) not completely sane.

    • ‘He hangs around with Ben and Anthony though, so maybe he's not right in the head.’
    • ‘‘Maybe he's not right in the head,’ he muttered, more to convince himself than Adam or his brothers.’
    • ‘Someone needs to lock that woman up, because she's not right in the head if she thinks that looks good.’
    • ‘‘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 said his sister was not right in the head, and had gone crazy and carried out the killings.’
    • ‘‘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.’
    • ‘He tells himself he has no business being in his position if he is not right in the head.’
    • ‘You have just proved you're not right in the head.’
    • ‘‘They say how they're not right in the head,’ said Willis.’
    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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