what does lunatic literally mean
â¢ LUNATIC (noun). The noun LUNATIC has 2 senses: 1. an insane person. 2. a reckless impetuous irresponsible person. Familiarity information: LUNATIC used as a noun is rare.â¢ LUNATIC (adjective). The adjective LUNATIC has 1 sense: 1. insane and believed to be affected by the phases of the moon. Familiarity information: LUNATIC used as an adjective is very rare. LUNATIC (adjective). The adjective LUNATIC has 1 sense: 1. insane and believed to be affected by the phases of the moon. Familiarity information: LUNATIC used as an adjective is very rare.