nonperforming
no-go
out of order
inefficaciousness
acopic
after a fashion
malfunctional
virtueless
inefficacy
mal-
inoperative
down
uneffigiated
off keel
unresponsive
hypo-
choke
second gear
underachieve
unefficacious
underperform
bad
out of commission
nonefficacious
nonsmoothly
malfunction
bunk
failure
off the boil
unconditioned
copout
cold spell
amiss
awry
haywire
wrong
less-than-stellar
unhappy
half-assed
broken
unprogressing
untranquilized
nonresponsiveness
nonoptimized
not going anywhere
unwell
ill-conditioned
buggered
unoptimized
unskilled
vacuitous
afunctional
incompetent
unsated
unsatisfied
unsatiated
ineffective
screw-loose
inefficient
unskillful
botchy
nonsuccessful
screwy
unsuccessfully
unsucceeding
doggishness
unimproving
butcherly
nonsmooth
unexceeded
unexcelled
nonmaintainable
infirm
ill
unmaintainable
unsatisfiable
unsurpassed
pseudodeficient
bite the big one
mesostable
indictment
indifferent
nonconsistency
backward
underperforming
subsagittate
poor
afunction
bland
out-of-service
undertested
prefunctional
unremedied
nonratable
down but not out
shabbily

English words for 'Not performing satisfactorily; not functioning well.'

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