Adjective
(usually in the phrase 'go off the deep end') Extremely angry.
I told him that I'd broken the vase, and he went off the deep end.
(idiomatic, US) Crazy, erratic, or irrational.
It used to be a funny comic, but lately it has gone off the deep end.
Synonyms: see Thesaurus:insane
Roger became a part of me, and when he went off the deep end and became a mad snake, I felt sorry for him. Michael Zaslow
Challenge yourself, jump off the deep end and learn to swim. Carson Kressley
I like to scare myself and throw myself off the deep end. Samantha Barks
With two thousand years of Christianity behind him... a man can't see a regiment of soldiers march past without going off the deep end. It starts off far too many ideas in his head. Louis-Ferdinand Céline
You know, modern liberals are just, I think frankly, totally off the deep end... their only answer is to yell racism and hide. Newt Gingrich
My parents always instilled in me this feeling of wanting to be a normal person. I never moved out to L.A. as a kid and got into that scene and that whole thing that happens to kid actors that's the reason they go off the deep end. Joseph Mazzello