having really keen sight
- very carefully observant or conscious; in search of possible risk
- excessively observant; watchful; sharp-sighted.
(a.) exceptionally observant; watchful; sharp-sighted.
The secret police provided but a poor substitute for the assistance which an argus-eyed and articulate public opinion gives to the efficient working of a constitutional system; for the greatest of autocrats has but two eyes, and it is no difficult task to deceive him.