rapid

rapid is an   Adverb

Definition:

[1] Very swift or quick; moving with celerity; fast; as, a rapid stream; a rapid flight; a rapid motion. Ascend my chariot; guide the rapid wheels. Milton.

[2] Advancing with haste or speed; speedy in progression; in quick sequence; as, rapid growth; rapid improvement; rapid recurrence; rapid succession.

[3] Quick in execution; as, a rapid penman.

Synonyms: