22 minutes ago, sandrewn said:

 

In the 17th century, the alternate adjective gleesome competed with gleeful — both come from an Old English root, gliu,

 

A few English words still carry both both suffixes, although the meaning or usage may have changed over time. Examples are awful and awesome, fearful and fearsome, playful and playsome, and for us word nerds, Joyful and joysome.