1
undivulged
1
unexposed
1
unfathomed
1
unheard
1
unheard of(verb, expression, phrasal verb, strange, indefinite)
1
unnamed(strange, indefinite, unidentified)
1
unnoted(strange, new, remote, indefinite, unidentified)
1
unplumbed
1
unrecognized(strange, new, remote, mysterious, indefinite)
1
unrenowned(strange, new, remote, mysterious, indefinite)
1
unseen
1
unspied
1
unsung(strange, new, remote, indefinite, unidentified)
1
unsuspected
1
untold(strange, new, remote, mysterious, indefinite)
1
untouched
1
weird
0
incognizable
0
a
0
abstruse
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APASmart Define. (2015). unexplained thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unexplained/thesaurus/synonyms
ChicagoSmart Define. 2015. "unexplained thesaurus" https://smartdefine.org/unexplained/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, unexplained thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unexplained/thesaurus/synonyms>.
MLASmart Define. "unexplained thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/unexplained/thesaurus/synonyms>