| impenetrable | |
| impervious | |
| impotent(adjective, inadequate, limited, feeble, useless) | |
| impracticable(weak, stupid, idle, useless, incompetent) | |
| impractical(weak, stupid, idle, useless, incompetent) | |
| in a meeting(expression, adjective, idiom, active, occupied) | |
| in conference(expression, adjective, lively, active, occupied) | |
| in the field(expression, adjective, idiom, active, occupied) | |
| in the laboratory(expression, adjective, idiom, active, occupied) | |
| in use(expression, full, involved, occupied, working) | |
| inaccessable | |
| inapt | |
| inconvenient | |
| increased(adjective, expensive, high-priced, pricey, pricely) | |
| individual | |
| industrious(adjective, lively, active, busy, occupied) | |
| inefficient(adjective, inadequate, limited, feeble, useless) | |
| inept(weak, stupid, idle, inadequate, feeble) | |
| inflated(adjective, expensive, high-priced, pricey, pricely) | |
| inoperative(weak, stupid, idle, inadequate, feeble) |
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| APA | Smart Define. (2015). unavailable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unavailable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unavailable thesaurus" https://smartdefine.org/unavailable/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, unavailable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unavailable/thesaurus/synonyms>. |
| MLA | Smart Define. "unavailable thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/unavailable/thesaurus/synonyms> |