80 entries under adjective topic. ×

3
indistinguishable
3
minute
3
obscured(out, hidden, lost, unable)
3
sightless
3
ulterior(hidden, unable)
3
unreal(hidden, unable)
2
faint
2
gaseous(hidden, unable)
2
inaudible
2
lost
2
unremarkable
2
vague
2
vaporous(hidden, unable)
1
blind
1
deceptive(hidden, unable)
1
discreet
1
ill-defined
1
imperceivable(obscure, dark, secret, unknown)
1
perdu(hidden, unable, concealment)
1
quiet
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APASmart Define. (2015). invisible thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/invisible/thesaurus/synonyms
ChicagoSmart Define. 2015. "invisible thesaurus" https://smartdefine.org/invisible/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, invisible thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/invisible/thesaurus/synonyms>.
MLASmart Define. "invisible thesaurus" 7 December 2015. Web. 27 September 2026. <https://smartdefine.org/invisible/thesaurus/synonyms>