Sharpnes or Sharpness: How To spell?
The word Sharpnes is misspelled against Sharpness, a noun meaning "The quality or condition of being sharp; keenness; acuteness."
Sharpness has double 'ss' in the end mispronounced as 's'Remember double 'SS' appears in the end of this word which should not be misspelled with single 'S'
Wrong Spelling:  sharpne-s  Correct Spelling:  sharpne-ss 
Explore spell check of Sharpness to spell without errors.