| ad interim | |
| adventitious | |
| aleatory | |
| ambivalent(open, doubtful, vague, hesitant, unsure) | |
| anxious(adjective, nervous, insecure, unsure) | |
| betwixt and between(expression, adjective, idiom, open, uncertain) | |
| blowing hot and cold | |
| casual | |
| causeless | |
| changeable(adjective, uncertain, irregular, doubtful, vague) | |
| confutable | |
| contestable | |
| controvertible | |
| critical | |
| deniable | |
| destinal | |
| dickey(adjective, unreliable, insecure, treacherous, incalculable) | |
| dicky(adjective, unreliable, insecure, treacherous, incalculable) | |
| diffident(uncertain, nervous, doubtful, insecure, unsure) | |
| disputed |
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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> |