Of a feeling, etc.: That cannot be appeased by expiation; implacable, irreconcilable. (Also transferred of an action.)

Uncontrollable, implacable. Obsolete. rare.

That may not be stanched.

= inextinguishable, adj. Of fire or flame (also figurative and transferred).

That cannot be governed; uncontrollable. Of temper, passion, etc.

Of feelings. (Cf. invincible, adj. 1b.)

That cannot be quenched or extinguished; unquenchable, inextinguishable.

Incapable of being surmounted or overcome; insurmountable. Of feelings.