80 entries under adjective topic. ×

6
dark(obscure, superior, mysterious, unknown)
6
insensible(knowledge, hidden, unable)
6
unnoticeable(knowledge, hidden, unable, imperceptible)
6
unperceivable(hidden, unable)
6
unrevealed(obscure, dark, superior, deep)
5
veiled(obscure, deep, hidden, unable)
5
imponderable(knowledge, hidden, unable, imperceptible)
5
masked(hidden, unable)
5
supernatural(obscure, dark, mysterious, hidden)
5
undisclosed(obscure, dark, unknown, hidden)
4
unexposed(obscure, dark, unknown, hidden)
4
buried(concealment, latent)
4
disguised(hidden, unable)
4
evanescent
4
undetectable
4
viewless
3
clandestine
3
ethereal(hidden, unable)
3
ghostly(obscure, dark, superior, mysterious)
3
ideal(hidden, unable)
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APASmart Define. (2015). invisible thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/invisible/thesaurus/synonyms
ChicagoSmart Define. 2015. "invisible thesaurus" https://smartdefine.org/invisible/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, invisible thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/invisible/thesaurus/synonyms>.
MLASmart Define. "invisible thesaurus" 7 December 2015. Web. 26 September 2026. <https://smartdefine.org/invisible/thesaurus/synonyms>