Dumbnes or Dumbness: How To spell?
The word Dumbnes is misspelled against Dumbness, a noun meaning "The quality or state of being dumb; muteness; silence; inability to speak."
Dumbness 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:  dumbne-s  Correct Spelling:  dumbne-ss 
Check more misspelled words of Dumbness to spell it correct.