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having keen eyes; vigilant; watchful.
Historical Examples

And that was the question that stared, Argus-eyed, at Jane Blair.
The Innocent Adventuress Mary Hastings Bradley

Her old nurse was Argus-eyed; and our meetings were such as only lovers can effect.
Carmen Ariza Charles Francis Stocking

Then from a short flight of inconceivable bliss, she fell, shot by one of her hundred Argus-eyed fears.
The Ordeal of Richard Feverel, Complete George Meredith

But to prevent disappointment we ought to mention that this phenomenon can only be witnessed by the Argus-eyed.
Punch, or the London Charivari, Vol. 152, March 7, 1917. Various

It was the on-coming of a grisly, striped, Argus-eyed multiped, with fifty heads.
The Red Debt Everett MacDonald

And with a “Well,” and a white-lipped smile and a glance at the Argus-eyed hotel, she held out her hand to me.
The Passionate Friends Herbert George Wells

The intervening sea is one over which the most penetrating of Argus-eyed policemen or sheriffs, can not see.
Punchinello, Vol. 1, No. 2, April 9, 1870 Various

Those agency employes were Argus-eyed, watching each move made by him and his assistants.
Oswald Langdon Carson Jay Lee

Slow and sure with such an Argus-eyed charmer must be all my movements.
Clarissa, Volume 4 (of 9) Samuel Richardson

Then from a short flight of inconceivable bliss, she fell, shot by one on her hundred Argus-eyed fears.
The Ordeal of Richard Feverel George Meredith

adjective
keen-sighted; observant; vigilant