un·fruit·ful /-ˈfrutfəl/
(a.)無效果的,徒然的,空的
Un·fruit·ful a. Not producing fruit or offspring; unproductive; infertile; barren; sterile; as, an unfruitful tree or animal; unfruitful soil; an unfruitful life or effort. -- Un*fruit*ful*ly, adv. -- Un*fruit*ful*ness, n.
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unfruitful
adj : not fruitful; not conducive to abundant production [ant: fruitful]