The Collaborative International Dictionary
Brainsick \Brain"sick`\, a. Disordered in the understanding; giddy; thoughtless. -- Brain"sick*ness, n.
Wiktionary
a. disordered in the understanding; giddy; thoughtless.
WordNet
adj. affected with madness or insanity; "a man who had gone mad" [syn: crazy, demented, distracted, disturbed, mad, sick, unbalanced, unhinged]
Wikipedia
Usage examples of "brainsick".
You may assure yourselves that, for my part, I doubt no whit but that all this tyrannical, proud, and brainsick invasion and occupation of my beloved England will yet prove the beginning, though not the end, of the ruin of that kingdom which, most treacherously, even in the midst of treating peace, began this wrongful war.
Scooting from her position at the edge of the bed, she backed toward the door, as if he had gone brainsick before her very eyes.
But there were arms still wrapped around her from behind, hands gripping her crossed wrists, she could not be falling, she could not be flying, she must only be dreaming the battered, brainsick dreams of the dead.