mismeet
uncompliance
unsatisfy
incompliable
dissatisfy
fall back
disagree
go nowhere
scantle
noncompliance
leave a lot to be desired
misplease
miss the mark
nonconform
welch
bite the big one
disobedience
noncommittal
omit
bail
missuit
bollocks up
underwhelm
drop the ball
nonacquiescence
break
bomb
go over like a lead balloon
nonfulfilment
unfulfillment
miss
nonadherence
nondeliverance
default
malfunction
flake
incompliance
nonconformance
fumblingness
mis-
disobey
nonfulfillment
paralyse
let the grass grow under one's feet
neglect
founder
nonobedience
misgrasp
fall flat on one's face
misacknowledge