Rapidness

rap·id  (rpd)

adj. rap·id·er, rap·id·est

Moving, acting, or occurring with great speed. See Synonyms at fast¹.

n.

An extremely fast-moving part of a river, caused by a steep descent in the riverbed. Often used in the plural.

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[Latin rapidus, from rapere, to seize; see rep- in Indo-European roots.]

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ra·pidi·ty (r-pd-t), rapid·ness (rpd-ns) n.

rapid·ly adv.

Thesaurus

Noun

1.

rapidness - a rate that is rapid celerity, rapidity, speediness, quickness pace, rate - the relative speed of progress or change; "he lived at a fast pace"; "he works at a great rate"; "the pace of events accelerated" fleetness - rapidity of movement; "fleetness of foot" immediateness, instancy, instantaneousness, immediacy - the quickness of action or occurrence; "the immediacy of their response"; "the instancy of modern communication" expeditiousness, despatch, dispatch, expedition - the property of being prompt and efficient; "it was done with dispatch" promptitude, promptness - the characteristic of doing things without delay