16
imperceptible(adjective, hard, knowledge, faint, subtle)
12
indistinct(adjective, obscure, ambiguous, imperceptible)
11
invisible(adjective, knowledge, obscure, dark, subtle)
10
indistinguishable(adjective, knowledge)
9
faint(adjective, unclear, subtle, hazy, imperceptible)
8
hidden(adjective, secret, unseen, invisible)
8
insensible(adjective, knowledge)
8
vague(adjective, imperceptible)
7
impalpable(adjective, knowledge, unsubstantial, intangible)
7
inappreciable(adjective, knowledge, imperceptible)
7
obscure(adjective, solid, dark, unknown, dense)
7
undetectable(adjective, subtle, indistinguishable, imperceptible, unremarkable)
6
unnoticeable(adjective, knowledge, subtle, imperceptible, unremarkable)
6
unobservable(adjective, knowledge, imperceptible, invisible)
5
blurred
5
camouflaged(adjective, invisible)
5
concealed(adjective, invisible)
5
ill-defined
5
intangible(adjective, knowledge)
5
latent(adjective, obscure, dark, secret, unknown)
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APASmart Define. (2015). indiscernible thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/indiscernible/thesaurus/synonyms
ChicagoSmart Define. 2015. "indiscernible thesaurus" https://smartdefine.org/indiscernible/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, indiscernible thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/indiscernible/thesaurus/synonyms>.
MLASmart Define. "indiscernible thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/indiscernible/thesaurus/synonyms>