| Swiftness (n.) The quality or state of being swift; speed; quickness; celerity; velocity; rapidity; as, the swiftness of a bird; the swiftness of a stream; swiftness of descent in a falling body; swiftness of thought, etc. Thesaurus Entries abruptness, agility, air speed, alacrity, bat, brevity, briefness, briskness, celerity, decisiveness, dispatch, expedition, expeditiousness, fastness, feverishness, flight, flit, flurry, furiousness, gait, ground speed, haste, hastiness, hurriedness, hurry, hustle, immediacy, immediateness, impetuosity, impetuousness, impulsiveness, instantaneousness, knots, lightning speed, miles per hour, nimbleness, pace, precipitance, precipitancy, precipitation, precipitousness, promptitude, promptness, punctuality, punctualness, quickness, rapidity, rashness, readiness, round pace, rpm, rush, rustle, sharpness, shortness, smartness, snappiness, speed, speediness, spryness, suddenness, summariness, swift rate, velocity |