ineffectual
inefficaciously
break down
crush
ineffectively
inutilitarian
no good
nutil
frustraneous
inefficacious
noneffective
nonfailure
inefficacy
inutility
ineffectiveness
duff
ineffectualness
ineffectivity
nugatory
imperviable
garbageness
disallowed
uneffective
come to nothing
blown
not worth a cress
drossy
unreliably
fruitless
shand
not worth a curse
not worth salt
successlessly
dys-
goodless
as much use as a chocolate fireguard
bomb
go to shit
uncompatible
nonfulfilment
turkey
waste of energy
waste of effort
vitiate
virtueless
invalidated
scabbed
uselessly
luckless
attempted
halt
good-for-nothing
impertinent
vacuitous
failureproof
clean
fail
silent
go out
go down the toilet
underfunction
vacuity
fall down
vacantness
vanity
unsuccessful
nonabridgment
nontested
nonefficacy
good for nothing
repine
waterproof
malfunction
futilely
nonprolongation
postfailure
Mother Hubbard
holding pattern
come to nought
not worth a dime
unavailingly
void
dead duck
unuseful
omit
dud
in vain
dust
pile of poo
upter
kamikaze
blow up in one's face
blow up
nonfinishing
unbeing
nonusable
unusable
inaneness
ineffectual
inutilitarian
no good
nutil
frustraneous
inefficacious
noneffective
duff
nugatory
imperviable
garbageness
disallowed
uneffective
blown
not worth a cress
drossy
fruitless
shand
not worth a curse
not worth salt
goodless
uncompatible
virtueless
invalidated
scabbed
luckless
attempted
good-for-nothing
impertinent
vacuitous
failureproof
clean
silent
unsuccessful
nontested
good for nothing
waterproof
postfailure
fail
Mother Hubbard
not worth a dime
unuseful
in vain
upter
nonusable
unusable
inefficaciously
ineffectively
unreliably
successlessly
uselessly
futilely
unavailingly
nonfailure
inefficacy
inutility
ineffectiveness
ineffectualness
ineffectivity
nonfulfilment
turkey
waste of energy
waste of effort
fail
vacuity
vacantness
vanity
nonabridgment
nonefficacy
nonprolongation
holding pattern
dead duck
dud
malfunction
dust
pile of poo
nonfinishing
unbeing
inaneness
break down
crush
come to nothing
bomb
go to shit
vitiate
halt
go out
go down the toilet
underfunction
fall down
repine
malfunction
come to nought
void
omit
kamikaze
blow up in one's face
blow up
English words for 'ineffective.'
As you may have noticed, above you will find words for "ineffective.". Hover the mouse over the word you'd like to know more about to view its definition. Click 
to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.
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covetousness
impasse
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detestable
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