—adj. 1. mentally deranged; demented; insane.
2. senseless; impractical; totally unsound: a crazy scheme. 3. Informal.intensely enthusiastic; passionately excited: crazy about baseball. 4. Informal.very enamored or infatuated (usually fol. by about): He was crazy about her. 5. Informal.intensely anxious or eager; impatient: I'm crazy to try those new skis. 6. Informal.unusual; bizarre; singular: She always wears a crazy hat.. 7. Slang.wonderful; excellent; perfect: That's crazy, man, crazy. 8. likely to break or fall to pieces.
9. weak, infirm, or sickly.
10. having an unusual, unexpected, or random quality, behavior, result, pattern, etc.: a crazy reel that spins in either direction. 11. like crazy, a. Slang.with great enthusiasm or energy; to an extreme: We shopped like crazy and bought all our Christmas gifts in one afternoon. b. with great speed or recklessness: He drives like crazy once he's out on the highway.
—n. 1. Slang.an unpredictable, nonconforming person; oddball: a house full of crazies who wear weird clothes and come in at all hours. 2. the crazies,Slang.a sense of extreme unease, nervousness, or panic; extreme jitters: The crew was starting to get the crazies from being cooped up belowdecks for so long.