unbeatable
certain
fated
fateful
indefeasible
ineluctable
inescapable
inevasible
inevitable
inexorable
inflexible
irresistible
irrevocable
necessary
relentless
resistless
sure
sure as death
sure as fate
unavoidable
uncontrollable
undeflectable
unpreventable
unyielding
berserk
impassable
impervious
implacable
impregnable
indestructible
insatiable
insurmountable
invincible
invulnerable
slow-motion
tireless
unassailable
unbreakable
undetectable
uninhabitable
valueless
stoppable