Im‐pla″ca‐ble (?), a. [L. implacabilis; pref. im- not + placabilis: cf. F. implacable. See Placable.] 1. Not placable; not to be appeased; incapable of being pacified; inexorable; as, an implacable prince.
I see thou art implacable. Milton.
An object of implacable enmity. Macaulay.
2. Incapable of being relieved or assuaged; inextinguishable.
O! how I burn with implacable fire. Spenser.
Which wrought them pain
Implacable, and many a dolorous groan. Milton.
Syn. — Unappeasable; inexorable; irreconcilable; unrelenting; relentless; unyielding.