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Synonyms for Quick-sighted (same or very similar meaning)

WordNet sense 1 (having very keen vision):
hawk-eyed, lynx-eyed, sharp-eyed, argus-eyed, keen-sighted, sharp-sighted

WordNet sense 2 (able to see):
sighted

WordNet sense 3 (having the ability to perceive or understand; keen in discernment):
perceptive


From the ODE community, based on WordNetadd/edit