crooked adj.

late 12c., "bend, cause to assume an angular or curved form," from crook (n.) or from an unrecorded Old English *crōcian. Intransitive sense of "to have a crooked shape, to bend or be bent" is from c. 1300. Crookback "hunchback" is from late 15c.

"not straight, curved like a strung bow," late 14c. (earlier ibent, c. 1300), from past participle of bend (v.). The meaning "turned or inclined in some direction" is from 1530s, probably as a translation of Latin inclinatio. The meaning "directed in a course" is from 1690s.

Used throughout 20c. in various slang and underworld senses: "criminal; illegal; stolen; corrupted; broken; insane; homosexual;" compare the slang uses of crooked. The figurative phrase bent out of shape "extremely upset" is 1960s in U.S. Air Force and college student slang.