at death's door

decaying doomed fading moribund

declining disintegrating ebbing fated final going mortal passing perishing sinking vanishing withering

at end of rope done for giving up the ghost in extremis on last leg one foot in grave

permanent

creating developing growing living reviving

at the end of the rope declining done for doomed expiring fading fated going mortal mortally ill on one's deathbed on one's last leg one foot in the grave passing perishing

in critical condition on one's deathbed on the critical list