| sporadic | |
| temporary | |
| tottery(adjective, unstable) | |
| undecided(adjective, uncertain, doubtful, vague, hesitant) | |
| undisciplined | |
| unorthodox | |
| unpremeditated(noun, adjective, passionate, violent, thoughtless) | |
| unresolved(adjective, doubtful, vague, hesitant, changeable) | |
| unrestrained | |
| vague(adjective, unstable, doubtful, hesitant, changeable) | |
| wishy-washy | |
| aberrant(adjective, irregular, unreliable, capricious, errant) | |
| abnormal(adjective, irregular, unreliable) | |
| adventitious | |
| aimless | |
| ambiguous(doubtful, vague, uneven, unsure, unbalanced) | |
| amorphous | |
| anomalous(adjective, irregular, unreliable) | |
| bizarre(adjective, strange, fantastic, individual, irregular) | |
| careless(passionate, violent, loose, unstable, unreasonable) |
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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> |