Aptnes or Aptness: How To spell?

The word Aptnes is misspelled against Aptness, a noun meaning "Disposition of the mind; propensity; as, the aptness of men to follow example."

--> Aptness 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:  aptne-s 
Correct Spelling:  aptne-ss 
Explore spell check of Aptness to spell without errors.

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