Exactnes or Exactness: How To spell?
The word Exactnes is misspelled against Exactness, a noun meaning "Careful observance of method and conformity to truth; as, exactness in accounts or business."
Exactness 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:  exactne-s  Correct Spelling:  exactne-ss 
Explore spell check of Exactness to spell without errors.