fall through
founder
fall flat
flop
die on one's arse
fizzle
bust
melt down
noncollapsable
come to nought
noncollapsible
naught
come to nothing
blow
sink like a stone
blow up
kamikaze
blow up in one's face
dys-
precollapse
collapse
waterproof
bottom fall out
nonaccumulation
halt
tumbledown
crash and burn
dead duck
repine
whiff
debilitated
nonfailure
infallible
waver
brickle
bomb
tumble down
taper off
fizzle out
no-win
peter out
pack up
shit the bed
unflourishing
fumblingness
go down the toilet
instability
fall down
mis-
go out
indiminishable
unravel
unceasable
go to shit
crumblingly
crumple
destabilize
downthrow
fatal system error
cave
hopeless
destabilise
go to smash
nonsurvival
nonstability
rout
fall flat on one's face
not win for losing
fall down on
spread-eagle
nontermination
failing
flopperoo
nondestruction
tits up
spreadeagle
imperviable
crumblement
give out
attempted
nonmaintenance
shakeable
strike out looking
shakable
a miss is as good as a mile
noncompletion
buggered
postcollapse
ruin
unsinkable
scissile
wallow
shipwreck
noncollapsable
noncollapsible
precollapse
waterproof
tumbledown
debilitated
infallible
no-win
unflourishing
indiminishable
unceasable
hopeless
tits up
imperviable
attempted
shakeable
shakable
buggered
postcollapse
unsinkable
scissile
crumblingly
flop
fizzle
bust
naught
nonaccumulation
dead duck
nonfailure
fumblingness
instability
downthrow
fatal system error
nonsurvival
nonstability
nontermination
failing
flopperoo
nondestruction
crumblement
nonmaintenance
noncompletion
fall through
founder
fall flat
flop
die on one's arse
melt down
come to nought
come to nothing
blow
sink like a stone
blow up
kamikaze
blow up in one's face
collapse
bottom fall out
halt
crash and burn
repine
whiff
waver
brickle
fizzle
bomb
tumble down
taper off
fizzle out
peter out
pack up
shit the bed
go down the toilet
fall down
go out
unravel
go to shit
crumple
destabilize
cave
destabilise
go to smash
rout
fall flat on one's face
not win for losing
fall down on
spread-eagle
spreadeagle
give out
strike out looking
ruin
wallow
shipwreck
bust
English words for 'fail utterly; collapse'
As you may have noticed, above you will find words for "fail utterly; collapse". 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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absurdly
plan of action
to get entangled
to use force
Causing sleep
a curve.
petit bourgeois
Strength of mind
great distance
nanocrystalline cellulose
scatophagy
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AND gate
imperial sanction
to cause repercussions
alienation.
Not adaptive
Blue Screen of Death (Windows error screen)
cherry blossom
an accident.
quiet place
jade
special selection
to handle roughly
give and take
having one's fill (of)
to flabbergast
now.
epistasis
in opposition
sulfate
wealthy family
conflicting
environmental variation
to bestride.
to lower.
loading and unloading
in the course of
darling.
bookworm
To shine
militarism
to get into trouble
funerary urn
happy-go-lucky
urging
receiver
ardent
pretty
warning