100 entries under unpredictable topic. ×

9
irresolute(adjective, uncertain, nervous, unstable, irregular)
9
mercurial(adjective, passionate, unstable, irregular, unsettled)
9
questionable(adjective, uncertain, dishonest, doubtful, deceitful)
9
vacillating(adjective, uncertain, nervous, unstable, irregular)
8
shifty(adjective, false, dishonest, deceitful, dubious)
7
fluctuating(adjective, unstable, irregular, unsettled)
7
indecisive(adjective, uncertain, nervous, unstable, doubtful)
7
temperamental(adjective, unreliable, erratic, moody)
7
tricky(adjective, difficult, delicate, false, awkward)
7
unassured(adjective, uncertain, nervous, dishonest, doubtful)
7
unsafe(adjective, dishonest, deceitful, unreliable)
6
fallible(adjective, unreliable, fickle, variable)
6
impulsive(adjective, unstable, irregular, unsettled)
6
irregular(adjective, unstable, unsettled, unreliable)
6
unsound(adjective, uncertain, unstable, feeble, unsettled)
5
indefinite(adjective, vague, unreliable, unknown)
5
trick(adjective, strong, unreliable, variable)
5
trustless(adjective, uncertain, dishonest, doubtful, deceitful)
5
unsettled(adjective, uncertain, unstable, irregular, vague)
4
careless(adjective, foolish, thoughtless, unreliable)
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APASmart Define. (2016). undependable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/undependable/thesaurus/synonyms
ChicagoSmart Define. 2016. "undependable thesaurus" https://smartdefine.org/undependable/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, undependable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/undependable/thesaurus/synonyms>.
MLASmart Define. "undependable thesaurus" 4 March 2016. Web. 24 September 2026. <https://smartdefine.org/undependable/thesaurus/synonyms>