/ Dictionary / Index B brainsick: Meaning and Definition of Find definitions for: brain•sick Pronunciation: (brān'sik"), [key] — adj. insane; crazy; mad. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: brainsick (Thesaurus) brain scan brainstem Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language