The word Deftnes is misspelled against Deftness, a noun meaning "The quality of being deft."
-->
Deftness 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:  deftne-s 
Correct Spelling:  deftne-ss 
Explore spell check of Deftness to spell without errors.