snowball's chance in hell
fat chance
slim chance
turn up trumps
dog's chance
beat the odds
to little avail
midlist
successlessness
unsuccess
on the bubble
unlikely
far-fetched
earthly
even chance
inconducive
unconducive
done
outside chance
semisuccessful
off chance
unmightiness
unpromising
unsuccessful
forlorn
in a pig's eye
doubtful
winnability
half-chance
unavailingly
almost doesn't count
fighting chance
lightning in a bottle
middling
poorly
unsuccessfully
long odds
failure
nonsuccess
shot in the dark
statistical significance
noncertainty
problematical
to no avail
likely
reservation
nonconclusive
sporting chance
fair chance
misfire