| going for broke(expression, adjective, idiom, delicate, uncertain) | |
| hanging by a thread(expression, adjective, idiom, delicate, uncertain) | |
| hazy(doubtful, shaky, vague, unsure, unlikely) | |
| hemming and hawing | |
| hesitant(adjective, open, uncertain, doubtful, vague) | |
| hopeless(adjective, unreliable, insecure, treacherous, incalculable) | |
| hundred-to-one(doubtful, unlikely, implausible) | |
| impugnable(adjective, delicate, uncertain, unstable, doubtful) | |
| in a quandary(expression, adjective, idiom, uncertain, nervous) | |
| in dispute | |
| in dubio | |
| in the middle | |
| incidental | |
| inconstant(adjective, uncertain, irregular, doubtful, vague) | |
| indefinite(open, uncertain, doubtful, unsettled, dubious) | |
| indistinct(doubtful, shaky, vague, unsure, unlikely) | |
| irrational | |
| irregular(adjective, unusual, uncertain, unstable, doubtful) | |
| irresolute(open, uncertain, nervous, doubtful, vague) | |
| irresponsible(adjective, unreliable, insecure, treacherous, incalculable) |
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| APA | Smart Define. (2015). iffy thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/iffy/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "iffy thesaurus" https://smartdefine.org/iffy/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, iffy thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/iffy/thesaurus/synonyms>. |
| MLA | Smart Define. "iffy thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/iffy/thesaurus/synonyms> |