| inadmissible(adjective, unacceptable) | |
| ineligible(adjective, weak, inadequate, useless, unfit) | |
| inexpert(adjective, weak, inadequate, useless, unfit) | |
| infertile(adjective, poor, small, insignificant, unimportant) | |
| inoperative(adjective, inutility) | |
| insubstantial(adjective, weak, slight, flat, poor) | |
| intolerable(adjective, unacceptable) | |
| inutile(adjective, useless, unfit, inutility) | |
| lean | |
| mediocre(adjective, bad, weak, poor, miserable) | |
| middling | |
| minor(adjective, light, weak, soft, slight) | |
| occasional(adjective, slight, short, inadequate, limited) | |
| odd | |
| parsimonious(weak, poor, scarce) | |
| pathetic | |
| reduced | |
| sectional(adjective, incomplete) | |
| seldom(adjective, slight, short, inadequate, limited) | |
| skimp(slight, small, miserable, inadequate, limited) |
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| APA | Smart Define. (2016). insufficient thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/insufficient/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "insufficient thesaurus" https://smartdefine.org/insufficient/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, insufficient thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/insufficient/thesaurus/synonyms>. |
| MLA | Smart Define. "insufficient thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/insufficient/thesaurus/synonyms> |