200 entries under adjective topic. ×

1
uncomplaining(soft, shy, meek, frugal)
1
unconcerned(indifferent, detached, aloof, distant)
1
unconvinced(indifferent, uncertain, nervous, doubtful)
1
unemotional(indifferent, detached, distant, apathetic)
1
unfeeling(indifferent, detached, distant, apathetic)
1
unflashy(person, feelings)
1
unimpressed(indifferent, detached, distant, apathetic)
1
uninterested(indifferent, detached, aloof, distant)
1
unmoved(indifferent, detached, distant, apathetic)
1
unmurmuring(soft, shy, meek, frugal)
1
unpoised(uncertain, nervous, worried, hesitant)
1
unprejudiced(indifferent, detached, distant, apathetic)
1
unrepugnant(soft, shy, meek, frugal)
1
unresponsive(close, quiet, gentle, mild)
1
unshowy(person, feelings)
1
unsociable
1
unsympathetic(indifferent, detached, distant, apathetic)
1
vacillatory
1
white-livered
0
blenching(hesitant, unconfident)
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APASmart Define. (2016). diffident thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/diffident/thesaurus/synonyms
ChicagoSmart Define. 2016. "diffident thesaurus" https://smartdefine.org/diffident/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, diffident thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/diffident/thesaurus/synonyms>.
MLASmart Define. "diffident thesaurus" 24 March 2016. Web. 20 September 2026. <https://smartdefine.org/diffident/thesaurus/synonyms>