| hell-bent for election(expression, idiom) | |
| hereupon(directly, immediately, instantly, shortly, forthwith) | |
| high-speed | |
| hot | |
| hour after hour(expression, idiom) | |
| hourly | |
| hungrily(earnestly, heartily, readily, promptly, sincerely) | |
| hurried | |
| hurry | |
| hurrying | |
| hysterically(intensely, fiercely, wildly) | |
| impulsively | |
| in a New York minute(expression, idiom, directly, immediately, instantly) | |
| in a minute | |
| in a second | |
| in double-quick time(expression, idiom) | |
| in double time(expression, idiom) | |
| in high | |
| in high gear(expression, idiom) | |
| in seven-league boots(expression, idiom) |
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| APA | Smart Define. (2015). rapidly thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/rapidly/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "rapidly thesaurus" https://smartdefine.org/rapidly/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, rapidly thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/rapidly/thesaurus/synonyms>. |
| MLA | Smart Define. "rapidly thesaurus" 5 October 2015. Web. 22 September 2026. <https://smartdefine.org/rapidly/thesaurus/synonyms> |