| impractical(adjective, unsound) | |
| imprecise(adjective, false, careless, uncertain) | |
| improper(adjective, false, careless, uncertain) | |
| inaccurate(adjective, false, careless, uncertain) | |
| incapable(adjective, unlikely, impossible) | |
| incorrect(adjective, false, careless, uncertain) | |
| indefinite(adjective, false, careless, uncertain) | |
| indirect(adjective, dishonest, equivocal) | |
| indiscreet(adjective, stupid) | |
| industrial(adjective, extraordinary, unusual, original) | |
| inefficient(adjective, unimportant) | |
| inexact(adjective, false, careless, uncertain) | |
| inexperienced(adjective, unlikely, impossible) | |
| insane(adjective, unsound) | |
| insincere(adjective, shy) | |
| interested(adjective, friendly, warm) | |
| interesting(adjective, clear, exciting) | |
| intermittent(adjective, dishonest, equivocal) | |
| interrupted(adjective, dishonest, equivocal, day-and-night, perennial) | |
| invention |
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| APA | Smart Define. (2015). matter of fact thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/matter_of_fact/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "matter of fact thesaurus" https://smartdefine.org/matter_of_fact/thesaurus/antonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, matter of fact thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/matter_of_fact/thesaurus/antonyms>. |
| MLA | Smart Define. "matter of fact thesaurus" 14 April 2015. Web. 30 September 2026. <https://smartdefine.org/matter_of_fact/thesaurus/antonyms> |