adverb

rapidly

rapidly, fast, quickly

The technology is developing very rapidly.

The technology is developing very rapidly.

She spoke so rapidly I could not understand her.

She spoke so rapidly I could not understand her.

((verb)) rapidly describes how an action is performed. The fire spread rapidly through the building.

Synonyms: quickly, fast, swiftly; Antonyms: slowly, gradually

Formed from the adjective 'rapid' and the adverb-forming suffix '-ly'.

This describes an action done in a 'rapid' manner. If you know 'rapid', just add '-ly' to describe the action.

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