3
unidentified(adjective, strange, new, remote, mysterious)
3
untraced
3
untracked(adjective, latency implication)
2
baffling(adjective, strange, inexplicable)
2
enigmatical
2
illegible(adjective, unintelligibility)
2
mystifying(adjective, strange, inexplicable)
2
obscure(adjective, strange, indefinite, unidentified, inexplicable)
2
peculiar
2
solved(verb, latency implication)
2
unapparent
2
uncharted(strange, new, remote, mysterious, indefinite)
2
undetermined(strange, indefinite, unidentified)
2
undeveloped
2
unheard-of(strange, new, remote, indefinite, unidentified)
2
uninvestigated
2
unknowable
2
unperceived(strange, new, remote, mysterious, indefinite)
2
unrevealed(strange, new, remote, mysterious, indefinite)
2
unsolved
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APASmart Define. (2015). unexplained thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/unexplained/thesaurus/synonyms
ChicagoSmart Define. 2015. "unexplained thesaurus" https://smartdefine.org/unexplained/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, unexplained thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/unexplained/thesaurus/synonyms>.
MLASmart Define. "unexplained thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/unexplained/thesaurus/synonyms>