Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
argus-eyed is an adjective meaning "having very keen vision". It carries 2 recorded senses.
having very keen vision
“quick-sighted as a cat”
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”
Definitions, synonyms and semantic relations for argus-eyed come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.