1
fallen between cracks(expression, idiom, out, hidden, missing)
1
fine
1
forfeit(confused, out, hidden, lost, unchangeable)
1
forfeited(confused, out, hidden, lost, unchangeable)
1
formless
1
fuzzy
1
germinal
1
gone(confused, out, hidden, lost, bewildered)
1
gone astray(expression, out, hidden, lost, missing)
1
gradual
1
granular
1
heavenly(obscure, dark, superior, mysterious, supernatural)
1
hermetic(obscure, dark, deep, mysterious, unknown)
1
hermetical(obscure, dark, secret, unknown, hidden)
1
homoeopathic
1
ill-defined
1
imperceivable(adjective, obscure, dark, secret, unknown)
1
in the dark(expression, idiom, obscure, dark, unknown)
1
indefinite
1
indiscoverable
10 years ago|20k views|share |citing 
APASmart Define. (2015). invisible thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/invisible/thesaurus/synonyms
ChicagoSmart Define. 2015. "invisible thesaurus" https://smartdefine.org/invisible/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, invisible thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/invisible/thesaurus/synonyms>.
MLASmart Define. "invisible thesaurus" 7 December 2015. Web. 24 September 2026. <https://smartdefine.org/invisible/thesaurus/synonyms>