1. Having very keen vision
   "quick-sighted as a cat"
   - argus-eyed, hawk-eyed, keen-sighted, lynx-eyed, sharp-eyed, sharp-sighted 
2. Keenly perceptive or alert
   "quick-sighted into the faults of the time"
   - sharp-sighted, sharp-eyed

See also: perceptive, sighted

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