RichThesaurus
Argus-eyed
vs
sharp-eyed
Argus-eyed
adj
ever vigilant
sharp-eyed
adj
Attentive, given to noticing things, aware.
Having acute vision; having good eyesight.
How often have the words
Argus-eyed
and
sharp-eyed
occurred in a corpus of books?
(source:
Google Ngram Viewer
)