Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun lunatic

2 senses of lunatic

Sense 1
lunatic, madman, maniac -- (an insane person)
       => sick person, diseased person, sufferer -- (a person suffering from an illness)

Sense 2
daredevil, madcap, hothead, swashbuckler, lunatic, harum-scarum -- (a reckless impetuous irresponsible person)
       => adventurer, venturer -- (a person who enjoys taking risks)

Antonyms of adj lunatic

1 sense of lunatic

Sense 1
lunatic, moonstruck -- (insane and believed to be affected by the phases of the moon)

INDIRECT (VIA insane) -> sane -- (mentally healthy; free from mental disorder; "appears to be completely sane")

Similarity of adj lunatic

1 sense of lunatic

Sense 1
lunatic, moonstruck -- (insane and believed to be affected by the phases of the moon)
       => insane (vs. sane) -- (afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter")