1) Abruptness 2) Acerbity 3) Acidity 4) Acuity 5) Acumination 6) Acuteness 7) Bitterness 8) Cheddar quality 9) Edge 10) Gradient 11) Intelligence 12) Keenness 13) Sheerness 14) Sourness 15) Spinosity 16) Tartness 1) Acerbity 2) Acuity 3) Acumen 4) Acuteness 5) Clarity 6) Discernability 7) Discernment 8) Distinctness 9) Edge 10) Insight 11) Intensity 12) Keenness 13) Legibility 14) Mordancy 15) Roughness 16) Shrewdness 17) Spiciness 18) Stridor 19) Unevenness 
• (n.) The quality or condition of being sharp; keenness; acuteness.
(from the article `photography, technology of`) ...bulky dual camera (Figure 3) with a fixed-mirror reflex housing and top screen mounted above a roll-film box camera. Its two lenses focus in ...
the apparent blurring of the border between two adjacent areas of a radiograph having different optical densities NOTE - It is attributable to two aspects of sharpness: 1. The quantitative measure of the linear rate of change of density across the border. 2. The subjective estimate of sharpness.
(Film cameras) The degree to which clear, distinguishable details of the subject are rendered in a photographic negative or print.
<microscopy> The visual impression of distinctness of detail in a photographic reproduction. ... (05 Aug 1998) ... 
An image degree of clarity in terms of focus and contrast
Sharp'ness noun [ Anglo-Saxon scearpness .] The quality or condition of being sharp; keenness; acuteness. 
A term used to describe the ability of a lens to render fine detail clearly; dependent on the contrast and resolution of a lens and varies with the f/stop; in general, a lens is sharpest at the middle apertures. Also technically can be explained as clarity of the photographic image in terms of focus and contrast. Largely subjective but can be measu...
[n] - thinness of edge or fineness of point
noun thinness of edge or fineness of point