unbeatable, unstanchable, unstaunchable, stopless, undeterrable, inexorable, unsuppressible, implacable, indomitable, unresistable, more...

stoppable, halting, checkable, arrestable

force, power, mighty, strong, unbreakable, invincible, undefeatable, more...

unable to stop,   can't be stopped,   cannot be stopped,   impossible to stop,   not stoppable,   cannot stop,   difficult to stop,   cant be stopped,   no stopping,   could not stop