Illustriousnes or Illustriousness: How To spell?
The word Illustriousnes is misspelled against Illustriousness, a noun meaning "The state or quality of being eminent; greatness; grandeur; glory; fame."
Illustriousness 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:  illustriousne-s  Correct Spelling:  illustriousne-ss 
Check more misspelled words of Illustriousness to spell it correct.