Knavishnes or Knavishness: How To spell?
The word Knavishnes is misspelled against Knavishness, a noun meaning "The quality or state of being knavish; knavery; dishonesty."
Knavishness 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:  knavishne-s  Correct Spelling:  knavishne-ss 
Find more wrongly spelled words of Knavishness to spell it well.