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Definition of rapid : 1. Advancing with haste or speed; speedy in progression; in quick sequence; as, rapid growth; rapid improvement; rapid recurrence; rapid succession.
2. Quick in execution; as, a rapid penman.
3. The part of a river where the current moves with great swiftness, but without actual waterfall or cascade; - usually in the plural; as, the Lachine rapids in the St. Lawrence.
4. Very swift or quick; moving with celerity; fast; as, a rapid stream; a rapid flight; a rapid motion.

Synonyms:

splitting, ready, lively, zippy, blistering, mercurial, agile, whirlwind, nippy, lightning, hell-for-leather, spry, prompt, short, fleet-footed, rapid-fire, active, rattling, sluggish, brief, winged, hot, dizzy, listless

hurrying, light-footed, expeditious, allegro, nimble, snappy, presto

in a flash/like a flash/quick as a flash, like mad, quickly, like a shot, frenetic

fast, abrupt, fleet, quick, pelting, impatient, brisk, hurried, running, breathless, breakneck, feverish, speedy, dashing, swift, galloping, rushing, urgent, bustling, darting, flying, hasty

Usage examples:

• Then there is a rapid running down till 45 lbs. - "Modern Machine-Shop Practice, Volumes I and II", Joshua Rose.
• I had led too much of an Indian life, not to know how to bear fatigue, and to be rapid in execution. - "Monsieur Violet", Frederick Marryat.
• It consisted of a rapid invasion of Belgium. - "History of the French Revolution from 1789 to 1814", F. A. M. Miguet.