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