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

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

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