[syn: alertness, sharp-sightedness, on the qui vive]
The Collaborative International Dictionary of English v.0.48:
Sharp-sighted \Sharp"-sight`ed\, a.
Having quick or acute sight; -- used literally and
figuratively. -- Sharp`-sight`ed*ness, n.
[1913 Webster]
WordNet (r) 3.0 (2006):
sharp-sightedness
n 1: sharpness of vision; the visual ability to resolve fine
detail (usually measured by a Snellen chart) [syn:
acuity, visual acuity, sharp-sightedness]
2: lively attentiveness [syn: alertness, sharp-sightedness,
on the qui vive]