rapidly

Derived from the adjective 'rapid', which comes from Latin 'rapidus', meaning 'seizing, snatching, or hurried'.

ADV (1)
[/ˈræp.ɪd.li/en-US]
迅速に literal / 速やかに literal / 急速に literal / 素早く informal / アッという間に colloquial / rapidly untranslatable (The exact concept of 'rapidly' as an adverb may not have a single direct translation, variances exist based on context.)
Synonyms quickly formal , swiftly formal
Antonyms slowly

Moving or occurring at a high speed; very quickly or swiftly. This adverb emphasizes the speed and often the pace of an action or change, rather than just its duration. While Japanese has many adverbs like 迅速に, 速やかに, 急速に, and 素早く that convey speed, 'rapidly' can imply a process or development that is not only fast but also accelerating or occurring over a short period with significant impact, making a single direct equivalent often context-dependent.

register: neutral