intelligent

adj

1. perspicacious, discerning, penetrating, perceptive, percipient, insightful; gifted, well-endowed, talented, intellectual, intelligential, brainy; educated, learned, instructed, well-schooled; erudite, knowledgeable, versed, well-read, aware, knowing, Fr. au fait; astute, shrewd, Sl. savvy, keen, long-headed, hard-headed, subtle; ace, topflight, top-drawer, first-rate, Inf. topnotch, Inf. crack, Sl. crackerjack, Sl. on the ball, Inf. whiz-bang, Brit. Sl. whizzo.

2. ingenious, apt, clever, adroit, deft, smart, foxy; alert, wide-awake, brilliant, luminous, bright, acute, sharp, sharp-witted, sharp as a tack; agile, quick, quick-witted, ready; sagacious, sage, wise, sapient, sapiential; rational, logical, reasonable, commonsensi-cal, having a good head on one's shoulders; judicious, prudent, sensible; able, capable, competent.

3. rational, conscious, higher order; sane, lucid