Accidentalnes or Accidentalness: How To spell?
The word Accidentalnes is misspelled against Accidentalness, a noun meaning "The quality of being accidental; casualness."
Accidentalness 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:  accidentalne-s  Correct Spelling:  accidentalne-ss 
Find more wrongly spelled words of Accidentalness to spell it well.