| error | |
| fable | |
| falsity | |
| hallucination(noun, dream, delusion, reality) | |
| misconception | |
| myth(noun, story, ancient) | |
| unreality | |
| abstract(noun, failure, fiction) | |
| adventure(noun, plan, safety, surety, abstention) | |
| apparition | |
| assumption | |
| beg | |
| belief(doubt, distrust) | |
| chimera | |
| conception | |
| daydream | |
| figment | |
| guess | |
| hazard(noun, chance, safety, luck) | |
| hypothesis |
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| APA | Smart Define. (2016). fact thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/fact/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "fact thesaurus" https://smartdefine.org/fact/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, fact thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/fact/thesaurus/antonyms>. |
| MLA | Smart Define. "fact thesaurus" 1 April 2016. Web. 24 September 2026. <https://smartdefine.org/fact/thesaurus/antonyms> |