Dullnes or Dullness: How To spell?
The word Dullnes is misspelled against Dullness, a noun meaning "The state of being dull; slowness; stupidity; heaviness; drowsiness; bluntness; obtuseness; dimness; want of luster; want of vividness, or of brightness."
Dullness 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:  dullne-s  Correct Spelling:  dullne-ss 
Check more misspelled words of Dullness to spell it correct.