| ingenious | |
| intellectual | |
| intense(adjective, dull, weak, moderate) | |
| intensify(verb, dull, severe, weaken) | |
| intriguing | |
| knowing(stupid, unintelligent) | |
| knowledgeable(dull, ignorant) | |
| mesmerizing | |
| on time | |
| once | |
| perceptive | |
| perspicacious | |
| posthaste(adjective, adverb, fast) | |
| precipitous | |
| precocious | |
| prestissimo | |
| presto | |
| promptly | |
| prudent | |
| racy |
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| APA | Smart Define. (2016). slow thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/slow/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "slow thesaurus" https://smartdefine.org/slow/thesaurus/antonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, slow thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/slow/thesaurus/antonyms>. |
| MLA | Smart Define. "slow thesaurus" 29 March 2016. Web. 25 September 2026. <https://smartdefine.org/slow/thesaurus/antonyms> |