| unbelievable(adjective, unreasonable, doubtful, dubious, suspicious) | |
| unconvincing(unreasonable, dubious, unlikely, flimsy, unbelievable) | |
| unpredictable | |
| unstable(adjective, delicate, uncertain, awkward, nervous) | |
| unsteady(adjective, delicate, uncertain, unstable, doubtful) | |
| vacillating(adjective, uncertain, nervous, doubtful, insecure) | |
| wavering(adjective, uncertain, nervous, doubtful, insecure) | |
| worrying | |
| Daedalean(adjective, hard, fancy, difficult, complex) | |
| adverse | |
| ambivalent | |
| amiss | |
| amphibological(vague, unclear, ambiguous, misleading, indistinct) | |
| backbreaker(tough, severe, painful, trying) | |
| betwixt and between(expression, adjective, idiom, uncertain, nervous) | |
| beyond belief | |
| bothering | |
| bothersome(tough, severe, painful, tricky, trying) | |
| bunglesome(adjective, aroused negative) | |
| can of worms(expression, adjective, idiom, hard, fancy) |
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| APA | Smart Define. (2016). problematic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/problematic/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "problematic thesaurus" https://smartdefine.org/problematic/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, problematic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/problematic/thesaurus/synonyms>. |
| MLA | Smart Define. "problematic thesaurus" 24 March 2016. Web. 22 September 2026. <https://smartdefine.org/problematic/thesaurus/synonyms> |