| in short order(expression, idiom, early, quickly, instantly) | |
| incessantly | |
| insanely(intensely, fiercely, wildly) | |
| instant | |
| intensely(fiercely, wildly, enthusiastically, energetically, aggressively) | |
| intently(earnestly, heartily, readily, promptly, sincerely) | |
| irrationally(intensely, fiercely, wildly) | |
| keen | |
| lickety-cut | |
| like now(expression, directly, immediately, instantly, shortly) | |
| like wildfire(expression, quickly, speedily) | |
| live | |
| lively | |
| longingly(earnestly, heartily, readily, promptly, sincerely) | |
| ludicrously(intensely, fiercely, wildly) | |
| meteorically | |
| month after month(expression, idiom) | |
| night and day(expression, idiom) | |
| nonsensically(intensely, fiercely, wildly) | |
| now(directly, immediately, instantly) |
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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> |