incompetent
irresponsible
aimless
barren
bootless
carefree
careless
counterproductive
easygoing
effete
empty
etiolated
fatuitous
fatuous
fruitless
fustian
futile
good-for-nothing
grasshopper
happy-go-lucky
heedless
impotent
improvident
inadequate
inadvertent
inane
incautious
ineffective
ineffectual
inefficacious
inoperative
invalid
lackadaisical
meaningless
negligent
no go
nonchalant
nugacious
nugatory
of no force
of no use
pointless
purposeless
reckless
remiss
shiftless
spiritless
sterile
superfluous
thoughtless
thriftless
acquisitive
avaricious
blear-eyed
brainless
effeminate
gluttonous
hairbrained
half-witted
hot-blooded
overconfident
poor-spirited
self-indulgent
shortsighted
slouchy
soft-hearted
uncaring
untrustworthy