Inertnes or Inertness: How To spell?

The word Inertnes is misspelled against Inertness, a noun meaning "Absence of the power of self-motion; inertia."

Inertness 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:  inertne-s 
Correct Spelling:  inertne-ss 
Explore spell check of Inertness to spell without errors.

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