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Extremely observant; vigilant.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
keen-sighted; observant; vigilant
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|Adj.||1.||argus-eyed - having very keen vision; "quick-sighted as a cat"|
sighted - able to see
|2.||argus-eyed - carefully observant or attentive; on the lookout for possible danger; "a policy of open-eyed awareness"; "the vigilant eye of the town watch"; "there was a watchful dignity in the room"; "a watchful parent with a toddler in tow"|
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