| lunacy | (noun) foolish or senseless behavior | Synonyms: craziness, folly, foolery, indulgence, tomfoolery |
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| (noun) obsolete terms for legal insanity | Synonyms: insaneness, madness |
| lunar | (adjective) of or relating to or associated with the moon | - |
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| lunate | (adjective) resembling the new moon in shape | Synonyms: crescent-shaped, crescent, semilunar |
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| lunatic | (adjective) insane and believed to be affected by the phases of the moon | Synonyms: moonstruck |
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| (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 |
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