unsatisfactory
defective
deficient
disappointing
disheartening
displeasing
dissatisfactory
empty
failing
found wanting
hungry
imperfect
inadequate
incommensurate
incompetent
incomplete
insufficient
lacking
not enough
not good enough
too little
unequal to
unfulfilling
ungratifying
unqualified
unsufficing
wanting
akin
ambivalent
delusive
disappoint
distasteful
disturb
dreamlike
flavorless
frustrate
illusory
impractical
inaccurate
inappropriate
inconclusive
ineffective
sapless
unattractive
unconvincing
unformed
unprofitable
unreal
satisfying