82 entries under adjective topic. ×

16
imperceptible(hard, knowledge, faint, subtle)
12
indistinct(obscure, ambiguous, imperceptible)
11
invisible(knowledge, obscure, dark, subtle)
10
indistinguishable
9
faint(unclear, subtle, hazy, imperceptible)
8
hidden(secret, unseen, invisible)
8
insensible
8
vague
7
impalpable(knowledge, unsubstantial, intangible)
7
inappreciable(knowledge, imperceptible)
7
obscure(solid, dark, unknown, dense)
7
undetectable(subtle, indistinguishable, imperceptible, unremarkable)
6
unnoticeable(knowledge, subtle, imperceptible, unremarkable)
6
unobservable(knowledge, imperceptible, invisible)
5
blurred
5
camouflaged
5
concealed
5
ill-defined
5
intangible
5
latent(obscure, dark, secret, unknown)
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APASmart Define. (2015). indiscernible thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/indiscernible/thesaurus/synonyms
ChicagoSmart Define. 2015. "indiscernible thesaurus" https://smartdefine.org/indiscernible/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, indiscernible thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/indiscernible/thesaurus/synonyms>.
MLASmart Define. "indiscernible thesaurus" 13 April 2015. Web. 26 September 2026. <https://smartdefine.org/indiscernible/thesaurus/synonyms>