3
perplexing(adjective, dark, uncertain, mysterious)
3
profound
2
ambiguous(adjective, dark, uncertain, mysterious, incoherent)
2
confusing(adjective, unintelligible)
2
cramped(adjective, restricted, confined, unintelligible, overcrowded)
2
hidden(unfathomable, enigmatic, sphinx-like)
2
inarticulate
2
recondite(adjective, dark, uncertain, mysterious)
2
secret(adjective, dark, uncertain, mysterious, unfathomable)
2
unexplainable(adjective, unfathomable, enigmatic, inexplicable, sphinx-like)
2
unexplained(adjective, unintelligibility)
2
unknowable(adjective, deep, incoherent, unfathomable, profound)
1
abstruse
1
amorphous
1
deep
1
equivocal(dark, uncertain, mysterious, incoherent, incomprehensible)
1
esoteric
1
ill-defined
1
incoherent
1
inconceivable
11 years ago|7.3k views|share |citing 
APASmart Define. (2015). indecipherable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/indecipherable/thesaurus/synonyms
ChicagoSmart Define. 2015. "indecipherable thesaurus" https://smartdefine.org/indecipherable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, indecipherable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/indecipherable/thesaurus/synonyms>.
MLASmart Define. "indecipherable thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/indecipherable/thesaurus/synonyms>