| APA | Smart Define. (1970). fast in understanding thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/fast_in_understanding/thesaurus/antonyms |
| Chicago | Smart Define. 1970. "fast in understanding thesaurus" https://smartdefine.org/fast_in_understanding/thesaurus/antonyms (accessed September 21, 2026). |
| Harvard | Smart Define 1970, fast in understanding thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/fast_in_understanding/thesaurus/antonyms>. |
| MLA | Smart Define. "fast in understanding thesaurus" 1 January 1970. Web. 21 September 2026. <https://smartdefine.org/fast_in_understanding/thesaurus/antonyms> |