inanition
hole
wanting
inutility
unoriginality
ineffective
leave a lot to be desired
inefficient
impuissant
helplessness
unableness
weakishness
weakness
defectible
misability
scant
backfire
absence
incapability
milksoppish
tristability
milksoppy
tiresomeness
imperviableness
flopdom
unworth
underfunction
shipwrecky
neutralize
lacklusterness
imperviability
skilllessness
bite the big one
limp-wristed
unthriving
cack-handedness
indifferentiability
wussify
hopeless
slender
insolidity
pithless
garbageness
impotency
strengthless
functionlessness
impotence
powerlessness