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[breyn-sik] /ˈbreɪnˌsɪk/
insane; crazy; mad.
Origin of brainsick
before 1000; Middle English brain-seke, Old English brægensēoc. See brain, sick1
Related forms
brainsickly, adverb
brainsickness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for brainsick
Historical Examples
  • To be brainsick and heartsick in a cruel and unfamiliar world is to be morbid.

    The Book of Susan Lee Wilson Dodd
  • And this man, at once unprincipled and brainsick, had in his keeping the understanding and the conscience of the unhappy Monmouth.

  • Posterity can do simply nothing for a man; nor even seem to do much if the man be not brainsick.

    Past and Present Thomas Carlyle
British Dictionary definitions for brainsick


relating to or caused by insanity; crazy; mad
Derived Forms
brainsickly, adverb
brainsickness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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