unproductive
abortive
acarpous
arid
barren
bootless
celibate
childless
counterproductive
desert
desolate
drained
dried-up
dry
effete
empty
etiolated
exhausted
failed
failing
fallow
fatuitous
fatuous
feckless
foiled
frustrated
futile
gainless
gaunt
gelded
idle
impotent
inadequate
inane
ineffective
ineffectual
inefficacious
infecund
infertile
inoperative
invalid
issueless
jejune
lame
leached
manque
arduous
ceaseless
desperate
endless
hopeless
interminable
painful
pointless
protracted
tedious
unavailing
unprofitable
unsuccessful
rootless