unsurvivable
formidable
hard-ass
undefeatable
unwithstandable
out of the woods
unsufferable
invincible
death grip
fight a losing battle
inviolable
heart attack
have the tiger by the tail
impassible
have a tiger by the tail
dead duck
get out
challenge
inexpugnable
antisurvival
inescapable
deadpan
problematic
no-win situation
unovercomeable
Catch-22
death throe
waterproof
fuck
dead in the water
impassable
exercise in futility
steel
vincible
do-or-die
unendable
indestructible
nonsurvival
unviable
you can't win them all
situation
frail
vivacious
unsimpable
unescapable
trying
nonviable
catch a cold
fail
get into trouble