Feeblenes or Feebleness: How To spell?
The word Feeblenes is misspelled against Feebleness, a noun meaning "The quality or condition of being feeble; debility; infirmity."
Feebleness 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:  feeblene-s  Correct Spelling:  feeblene-ss 
Explore spell check of Feebleness to spell without errors.