21
inconspicuous
16
unclear
16
subtle
13
invisible(adjective, hidden, unable)
13
mysterious(adjective, secret, concealed)
12
obscure(adjective, understood)
11
ambiguous(adjective, dull, clear, obscure, plain)
11
complex(adjective, difficult, involved, intricate)
11
hidden
11
vague(adjective, dull, clear, obscure, plain)
8
imperceptible(adjective, hard, faint)
6
misty
6
unobvious
6
foggy
5
clandestine
5
equivocal(adjective, uncertain, doubtful)
4
absent
4
indefinite
4
indistinct
3
concealed
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APASmart Define. (2016). obvious thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/obvious/thesaurus/antonyms
ChicagoSmart Define. 2016. "obvious thesaurus" https://smartdefine.org/obvious/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2016, obvious thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/obvious/thesaurus/antonyms>.
MLASmart Define. "obvious thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/obvious/thesaurus/antonyms>