7
imperceptible(adjective, hard, faint, obvious, invisible)
6
invisible
4
obscure(adjective, invisible, understood)
4
unrelatable
3
unnoticeable(adjective, invisible)
3
vague(adjective, invisible)
2
impalpable(adjective, unsubstantial, intangible)
2
indistinct(adjective, invisible)
2
camouflaged
2
in mind
1
ambiguous(adjective, invisible)
1
disguised
1
inaudible
1
inconspicuous
1
indiscernible
1
indistinguishable
1
intangible(adjective, indefinite, obscured)
1
silent(adjective, invisible)
1
undetectable
1
unperceivable
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APASmart Define. (2015). perceptible thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/perceptible/thesaurus/antonyms
ChicagoSmart Define. 2015. "perceptible thesaurus" https://smartdefine.org/perceptible/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2015, perceptible thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/perceptible/thesaurus/antonyms>.
MLASmart Define. "perceptible thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/perceptible/thesaurus/antonyms>