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intelligent

intelligent - adjective

  1. Having or showing intelligence, often of a high order: brilliant, intellectual, knowing, knowledgeable. Informal brainy. See ability.
  2. Mentally quick and original: alert, bright, clever, keen, quick, quick-witted, sharp, sharp-witted, smart. See ability.
  3. Consistent with reason and intellect: consequent, logical, rational, reasonable. See reason.