| unaccountable(careless, immoral, thoughtless, reckless, negligent) | |
| unclear(adjective, doubtful, vague, hesitant, changeable) | |
| uncontrolled | |
| undeterminable | |
| undetermined(doubtful, vague, hesitant, changeable, unsure) | |
| unfaithful(adjective, changeable, fickle, variable, undependable) | |
| unhealthy(risky, dangerous, unsafe) | |
| unlooked-for | |
| unplanned(noun, adjective) | |
| unsteadfast | |
| unusual(adjective, irregular, unreliable, fanciful, quirky) | |
| vacillant(adjective, hesitant) | |
| vagrant(unstable, unsettled, variable, erratic, pointless) | |
| versatile(unstable, unsettled, variable) | |
| wacky(adjective, unusual, strange, silly, crazy) | |
| wanton | |
| weird(adjective, unusual, strange, crazy, irregular) | |
| without warning(expression, extraordinary, wonderful, shocking, astonishing) | |
| light(impulsive, explosive) | |
| abrupt(passionate, violent, thoughtless, impetuous, unwary) |
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| APA | Smart Define. (2015). unpredictable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/unpredictable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unpredictable thesaurus" https://smartdefine.org/unpredictable/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, unpredictable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/unpredictable/thesaurus/synonyms>. |
| MLA | Smart Define. "unpredictable thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/unpredictable/thesaurus/synonyms> |