1
doubtful(adjective, singular)
1
eerie(adjective, paranormal, mystic, mystical)
1
emblematical
1
enigmatical(adjective, solid, strange, dense, spiritual)
1
equivocal(adjective, strange, unknown, incoherent, curious)
1
esoteric(adjective, strange, deep, supernatural, hidden)
1
extraordinary(adjective, strange, unbelievable, implausible, unfathomable)
1
extrasensory(adjective, obscure, dark, superior, supernatural)
1
fabulous(adjective, obscure, dark, superior, mysterious)
1
fairy(adjective, obscure, dark, superior, mysterious)
1
fantastic(adjective, extraordinary, strange, unbelievable, implausible)
1
fathomless(adjective, incoherent, unfathomable, incomprehensible, impenetrable)
1
furtive(adjective, strange, unknown, curious, concealed)
1
ghostly(adjective, obscure, dark, superior, mysterious)
1
heavenly(adjective, obscure, dark, superior, mysterious)
1
imcomprehensible(adjective, extraordinary, belief, strange, unbelievable)
1
impossible(adjective, extraordinary, strange, unbelievable, implausible)
1
improbable(adjective, extraordinary, strange, unbelievable, implausible)
1
incogitable(adjective, extraordinary, belief, strange, fantastic)
1
incredible(adjective, extraordinary, strange, unbelievable, implausible)
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APASmart Define. (2015). unknowable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unknowable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unknowable thesaurus" https://smartdefine.org/unknowable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, unknowable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unknowable/thesaurus/synonyms>.
MLASmart Define. "unknowable thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/unknowable/thesaurus/synonyms>