Thinnes or Thinness: How To spell?
The word Thinnes is misspelled against Thinness, a noun meaning "The quality or state of being thin (in any of the senses of the word)."
Thinness 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:  thinne-s  Correct Spelling:  thinne-ss 
Find more wrongly spelled words of Thinness to spell it well.