| unanswered(adjective, refuted) | |
| unascertained(strange, indefinite, unidentified) | |
| undefended | |
| undeterminable | |
| unexplained(strange, indefinite, unidentified) | |
| unfastened | |
| unforeseeable(doubtful, vague, hesitant, changeable, unsure) | |
| unknown(adjective, rough, strange, new, determined) | |
| unpredictable(doubtful, vague, hesitant, changeable, unsure) | |
| unspecific(adjective, vague, unknown, general, unclear) | |
| unsteady(adjective, weak, uncertain, doubtful, hesitant) | |
| untold(strange, indefinite, unidentified) | |
| up for grabs(expression, idiom, doubtful, vague, hesitant) | |
| up in the air(expression, adjective, idiom, open, certain) | |
| waffling(adjective, open, weak, uncertain, doubtful) | |
| weak(adjective, obscure, dark, uncertain, doubtful) | |
| wishy-washy(adjective, open, weak, uncertain, doubtful) | |
| abeyance | |
| abstruse | |
| aleatoric |
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| APA | Smart Define. (2015). undetermined thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/undetermined/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "undetermined thesaurus" https://smartdefine.org/undetermined/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, undetermined thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/undetermined/thesaurus/synonyms>. |
| MLA | Smart Define. "undetermined thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/undetermined/thesaurus/synonyms> |