Fruitful :: Fruitful (a.) Full of fruit; producing fruit abundantly; bearing results; prolific; fertile; liberal; bountiful; as, a fruitful tree, or season, or soil; a fruitful wife..
Unfruitful :: Unfruitful (a.) Not producing fruit or offspring; unproductive; infertile; barren; sterile; as, an unfruitful tree or animal; unfruitful soil; an unfruitful life or effort..