54 entries under adjective topic. ×

7
imperceptible(hard, faint, obvious, invisible)
6
invisible
4
obscure(invisible, understood)
3
unnoticeable
3
vague
2
impalpable(unsubstantial, intangible)
2
indistinct
1
ambiguous
1
inaudible
1
inconspicuous
1
indistinguishable
1
intangible(indefinite, obscured)
1
silent
1
undetectable
1
faint
0
hidden
0
trivial
0
airy
0
bland
0
bloodless
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APASmart Define. (2015). perceptible thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/perceptible/thesaurus/antonyms
ChicagoSmart Define. 2015. "perceptible thesaurus" https://smartdefine.org/perceptible/thesaurus/antonyms (accessed September 28, 2026).
HarvardSmart Define 2015, perceptible thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/perceptible/thesaurus/antonyms>.
MLASmart Define. "perceptible thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/perceptible/thesaurus/antonyms>