A quality of moving fast, physically or mentally, is quickness. The quickness of your reaction saved your little sister from falling off the monkey bars and hitting her head.

Quickness is almost always a positive attribute, whether it's the quickness of a cornerback on a football field or an improv comic's quickness of phrase. Because it describes super speedy action, this word can also be used for a fast, fiery disposition: "His quickness of temper doesn't make him an ideal candidate for the job." The original meaning of this word, dating from about 1200, was "state of being alive."

Definitions of quickness
  1. noun
    a rate that is rapid
    synonyms: celerity, rapidity, rapidness, speediness
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    rapidity of movement
    immediacy, immediateness, instancy, instantaneousness
    the quickness of action or occurrence
    despatch, dispatch, expedition, expeditiousness
    the property of being prompt and efficient
    promptitude, promptness
    the characteristic of doing things without delay
    type of:
    clip, pace, rate
    the relative speed of progress or change
  2. noun
    intelligence as revealed by an ability to give correct responses without delay
    synonyms: mental quickness, quick-wittedness
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    type of:
    the ability to comprehend; to understand and profit from experience
  3. noun
    skillful performance or ability without difficulty
    synonyms: adeptness, adroitness, deftness, facility
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    deftness in handling matters
    dexterity, manual dexterity, sleight
    adroitness in using the hands
    capstone, copestone, finishing touch
    a final touch; a crowning achievement; a culmination
    type of:
    the state of being cognitively skillful
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