Sleeknes or Sleekness: How To spell?
The word Sleeknes is misspelled against Sleekness, a noun meaning "The quality or state of being sleek; smoothness and glossiness of surface."
Sleekness 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:  sleekne-s  Correct Spelling:  sleekne-ss 
Explore spell check of Sleekness to spell without errors.