| immutable | |
| in quick succession(expression, idiom, frequency) | |
| in rapid succession(expression, idiom, frequency) | |
| in the interim(expression, idiom, time) | |
| in the meantime(expression, idiom, time) | |
| incessant | |
| indissoluble | |
| indissolubly | |
| interim | |
| interval | |
| invariable | |
| invariably habit(expression, idiom, frequency) | |
| invariant | |
| iterant(adjective, intermittent, isochronal, seasonal) | |
| lasting | |
| lenten | |
| like clockwork(expression, adjective, intermittent, isochronal, seasonal) | |
| lookout | |
| low-paid | |
| meantime |
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| APA | Smart Define. (2015). hourly thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/hourly/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hourly thesaurus" https://smartdefine.org/hourly/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, hourly thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/hourly/thesaurus/synonyms>. |
| MLA | Smart Define. "hourly thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/hourly/thesaurus/synonyms> |