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(informal) an insane person

a mentally unstable person who acts irrationally or foolishly; an eccentric person
Usage Note



An insane or very eccentric person; nut: dedication to a cause that marked them as fanatics of a sort, the wealthy headcases, and professional haters (1970s+)


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  • Headcloth

    [hed-klawth, -kloth] /ˈhɛdˌklɔθ, -ˌklɒθ/ noun, plural headcloths [hed-klawth z, -kloth z, -klawths, -kloths] /ˈhɛdˌklɔðz, -ˌklɒðz, -ˌklɔθs, -ˌklɒθs/ (Show IPA) 1. any cloth for covering the head, as a turban or wimple.

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    noun 1. the part of a bridle that fits round a horse’s head Also called (esp US) headstall

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