Antonyms of SLUGGISH

Examples of usage:

  1. Accustomed to sluggish movements on their part, he had not expected an invasion in force before the spring, and here it was in the first days of January. "The Life of Napoleon I (Volumes, 1 and 2)" by John Holland Rose
  2. The current was very sluggish; not more than a mile an hour. "How I Found Livingstone" by Sir Henry M. Stanley
  3. Sleep fled; the circulation grew sluggish, and both he and I knew that the result hung on the hour. "Half a Century" by Jane Grey Cannon Swisshelm
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