sharp-sighted russian

• зо́ркий

  sharp-eyed, sharp-sighted, keen-eyed

  vigilant, watchful, observant

• острогла́зый

  sharp-eyed, sharp-sighted, keen-eyed

• зо́рко

  vigilantly, with a vigilant eye, watchfully

  keenly, with sharp eyes, sharp-sightedly

• зо́ркость

  vigilance, sharp-sightedness