Deceptivenes or Deceptiveness: How To spell?
The word Deceptivenes is misspelled against Deceptiveness, a noun meaning "The power or habit of deceiving; tendency or aptness to deceive."
Deceptiveness 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:  deceptivene-s  Correct Spelling:  deceptivene-ss 
Find more wrongly spelled words of Deceptiveness to spell it well.