| Word | Definitions | Synonyms |
|---|---|---|
| lunacy | (noun) foolish or senseless behavior | Synonyms: craziness, folly, foolery, indulgence, tomfoolery |
| (noun) obsolete terms for legal insanity | Synonyms: insaneness, madness | |
| lunatic | (noun) an insane person | Synonyms: maniac |
| (noun) a reckless impetuous irresponsible person | Synonyms: daredevil, harum-scarum, hothead, madcap, swashbuckler | |
| lunation | (noun) the period between successive new moons (29.531 days) | Synonyms: lunar month, moon, synodic month |