[ breyn-sik ]
/ ˈbreɪnˌsɪk /


insane; crazy; mad.

Origin of brainsick

before 1000; Middle English brain-seke, Old English brægensēoc. See brain, sick1

Related forms

brain·sick·ly, adverbbrain·sick·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for brainsick

  • 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
  • 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.

British Dictionary definitions for brainsick


/ (ˈbreɪnˌsɪk) /


relating to or caused by insanity; crazy; mad

Derived Forms

brainsickly, adverbbrainsickness, 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