impotent
toothless
unproductive
useless
Sisyphean
abortive
acarpous
aimless
arid
barren
blank
bootless
borne
celibate
childless
counterproductive
danaidean
dead
desert
desolate
dintless
drained
dried-up
dry
effete
emasculate
empty
etiolated
exhausted
failed
failing
fallow
fatuitous
fatuous
featherweight
feckless
forceless
fruitless
futile
gaunt
gelded
idler
ill
ill-qualified
inadequate
inane
incapable
incompetent
ineffective
ineffectuality
ineffectually
ineffectualness
desperate
feeble
hopeless
incoherent
insignificant
pointless
powerless
unavailing
unprofitable
unsatisfactory
intellectual
effective
effectual
impressive