| harmless | |
| head and front(expression, idiom, importance) | |
| heart | |
| immorality | |
| important part(expression, idiom, importance) | |
| in no degree(expression, idiom, neverness) | |
| indefensible | |
| infecund | |
| infertile | |
| iniquity | |
| inoperative | |
| issueless | |
| kernel | |
| keynote | |
| keystone | |
| leisurely | |
| main chance(expression, idiom, importance) | |
| matter of necessity(expression, idiom, requirement) | |
| median | |
| minute |
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| APA | Smart Define. (2015). sine thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/sine/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sine thesaurus" https://smartdefine.org/sine/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, sine thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/sine/thesaurus/synonyms>. |
| MLA | Smart Define. "sine thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/sine/thesaurus/synonyms> |