| icky(adjective, nasty, offensive, unpleasant, disgusting) | |
| inconsequential(adjective, unimportant) | |
| inconsistent(adjective, irresolute) | |
| indifferent | |
| infirm(adjective, irresolute) | |
| insignificant(adjective, unimportant) | |
| irrelevant(adjective, unimportant) | |
| irresponsible(adjective, irresolute) | |
| juvenile | |
| lackluster(adjective, dull, weak, dry, boring) | |
| languid(weak, feeble, lackluster, indecisive) | |
| lax(adjective, mild) | |
| level | |
| matter-of-fact(adjective, dull, simple, boring, bland) | |
| maudlin(adjective, soft, sweet, emotional, affected) | |
| meek(adjective, calm, kind, smooth, soft) | |
| milquetoast(adjective, tasteless) | |
| minute(adjective, unimportant) | |
| modest(adjective, dull, simple, plain, indifferent) | |
| monotone(adjective, dull, boring, routine, tedious) |
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| APA | Smart Define. (2015). insipid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/insipid/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "insipid thesaurus" https://smartdefine.org/insipid/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, insipid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/insipid/thesaurus/synonyms>. |
| MLA | Smart Define. "insipid thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/insipid/thesaurus/synonyms> |