5
impenetrable(adjective, incomprehensible)
5
unfathomable(adjective, hard, difficult, solid, deep)
3
mysterious
3
unintelligible(adjective, solid, deep, dense, incoherent)
2
incomprehensible(adjective, understandable)
2
unknowable(solid, deep, dense, incoherent, unfathomable)
1
Delphic(solid, dense, unfathomable, impenetrable, unintelligible)
1
baffling(adjective, solid, deep, dense, unfathomable)
1
dense
1
enigmatic
1
enigmatical(adjective, solid, dense, unfathomable, unintelligible)
1
impassable
1
incognizable(solid, deep, dense, incoherent, unfathomable)
1
indiscernible(solid, dense, imperceptible, unfathomable, unseen)
1
inexplicable
1
inscrutable
1
invisible(adjective, hidden, unable)
1
not understandable
1
obscure(adjective, solid, deep, dense, incoherent)
1
sibylline(solid, dense, unfathomable, impenetrable, unintelligible)
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APASmart Define. (2015). ungraspable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/ungraspable/thesaurus/synonyms
ChicagoSmart Define. 2015. "ungraspable thesaurus" https://smartdefine.org/ungraspable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, ungraspable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/ungraspable/thesaurus/synonyms>.
MLASmart Define. "ungraspable thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/ungraspable/thesaurus/synonyms>