2
able
2
faint(adjective, still, unclear, hazy, hushed)
2
obscure
2
rare(adjective, improbability, infrequency)
2
still(adjective, silent, hushed, soundless)
2
undiscovered
2
unexplored
2
unperceived
2
unprecedented(unconformity, infrequency)
1
buttoned up(expression, still, hushed, soundless)
1
checked(still, faint, unclear, hushed, soundless)
1
clammed up(expression, still, hushed, soundless)
1
close(still, hushed, soundless)
1
closed up(expression, still, faint, unclear, hushed)
1
closemouthed(still, hushed, soundless)
1
curbed(still, faint, unclear, hushed, soundless)
1
different
1
dumb(still, hushed, soundless)
1
dummied up(expression, still, hushed, soundless)
1
enigmatic
10 years ago|2.3k views|share |citing 
APASmart Define. (2016). unheard thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unheard/thesaurus/synonyms
ChicagoSmart Define. 2016. "unheard thesaurus" https://smartdefine.org/unheard/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, unheard thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unheard/thesaurus/synonyms>.
MLASmart Define. "unheard thesaurus" 18 February 2016. Web. 27 September 2026. <https://smartdefine.org/unheard/thesaurus/synonyms>