- Definitions|0
- Thesaurus|218
- Abbreviations|0
| undependable(uncertain, doubtful, unsure) | |
| under discussion | |
| under suspicion | |
| unfinished(adjective, open, uncertain, unsettled, vague) | |
| unforeseeable(doubtful, vague, unsure) | |
| unknown(anxious, worried, troubled, concerned) | |
| unlikely(uncertain, doubtful, shaky, unsure, unpromising) | |
| unpromising(shaky, unlikely) | |
| unquestioned(adjective, unchallenged) | |
| unrefuted(adjective, unchallenged) | |
| unreliable(uncertain, doubtful, vague, unsure) | |
| unsolved | |
| unspecific | |
| unspecified | |
| unstable(shaky, unlikely, unpromising) | |
| unstably | |
| untrustworthy(uncertain, doubtful, unsure) | |
| untrusty(uncertain, doubtful, unsure) | |
| up for grabs(expression, idiom, doubtful, shaky, vague) | |
| vacillating(uncertain, doubtful, unsettled, vague, unsure) |
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| APA | Smart Define. (2015). in doubt thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/in_doubt/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "in doubt thesaurus" https://smartdefine.org/in_doubt/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, in doubt thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/in_doubt/thesaurus/synonyms>. |
| MLA | Smart Define. "in doubt thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/in_doubt/thesaurus/synonyms> |