| how | |
| hypothesis | |
| hypothetical | |
| if not(expression, idiom) | |
| if only(expression, idiom) | |
| illegal | |
| illegitimate | |
| illicit | |
| illusion | |
| imagine | |
| improper | |
| in case that(conjunction, that) | |
| in certain circumstances(expression, idiom, circumstance) | |
| inattentive | |
| inconsiderate | |
| incorrect | |
| infer | |
| initiation factors(expression, idiom) | |
| into | |
| investigate |
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| APA | Smart Define. (2016). if thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/if/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "if thesaurus" https://smartdefine.org/if/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, if thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/if/thesaurus/synonyms>. |
| MLA | Smart Define. "if thesaurus" 30 March 2016. Web. 22 September 2026. <https://smartdefine.org/if/thesaurus/synonyms> |