chimerical \ky-MER-ih-kuhl; -MIR-; kih-\, adjective: 1. Merely imaginary; produced by or as if by a wildly fanciful imagination; fantastic; improbable or unrealistic. 2. Given to or indulging in unrealistic fantasies or fantastic schemes. But those risks are real, not chimerical. -- George J.... Sign in to see full entry.