| fat chance(expression, uncertain, shaky, unclear, unlikely) | |
| fearful(adjective, wicked) | |
| fiddly | |
| fiendish(adjective, wicked) | |
| fierce(adjective, wicked) | |
| fiery(unstable, unpredictable, volatile) | |
| fishy(uncertain, shaky, unclear, unlikely, questionable) | |
| fluctuant(unstable, vulnerable, risky, dangerous, unprotected) | |
| fluky(adjective, chancy) | |
| forceful(unstable, unpredictable, volatile) | |
| formidable(adjective, dangerous) | |
| fragile | |
| frail(unstable, vulnerable, dangerous, unprotected, precarious) | |
| frenzied(anxious, unstable, worried, unpredictable, volatile) | |
| full of risk(expression, idiom) | |
| fulminant(unstable, unpredictable, volatile) | |
| fulminating(unstable, unpredictable, volatile) | |
| going for broke(expression, adjective, idiom, delicate, uncertain) | |
| grouchy(adjective, delicate, sensitive, tricky, impatient) | |
| groundless |
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| APA | Smart Define. (2015). hazardous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/hazardous/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hazardous thesaurus" https://smartdefine.org/hazardous/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, hazardous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/hazardous/thesaurus/synonyms>. |
| MLA | Smart Define. "hazardous thesaurus" 19 August 2015. Web. 25 September 2026. <https://smartdefine.org/hazardous/thesaurus/synonyms> |