Synonyms|427Antonyms|150|Broader|0Narrower|0Related|2k
15
clever
8
intelligent(adjective, mind, behavior, idiotism)
5
logical
5
wise
4
reasonable
4
sound
3
rational
3
brainy
3
earnest
3
grave
2
bright
2
judicious
2
melancholy
2
no-nonsense
2
prudent
2
sagacious
2
sane
2
sapient
2
sedate
2
sensible
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ChicagoSmart Define. 2015. "harebrained thesaurus" https://smartdefine.org/harebrained/thesaurus/antonyms (accessed September 22, 2026).
HarvardSmart Define 2015, harebrained thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/harebrained/thesaurus/antonyms>.
MLASmart Define. "harebrained thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/harebrained/thesaurus/antonyms>