implacable

[ im-plak-uh-buhl, -pley-kuh- ]
/ ɪmˈplæk ə bəl, -ˈpleɪ kə- /

adjective

not to be appeased, mollified, or pacified; inexorable: an implacable enemy.

Origin of implacable

First recorded in 1375–1425; late Middle English word from Latin word implācābilis. See im-2, placable

OTHER WORDS FROM implacable

im·plac·a·bil·i·ty, im·plac·a·ble·ness, noun im·plac·a·bly, adverb

Example sentences from the Web for implacable

British Dictionary definitions for implacable

implacable
/ (ɪmˈplækəbəl) /

adjective

incapable of being placated or pacified; unappeasable
inflexible; intractable

Derived forms of implacable

implacability or implacableness, noun implacably, adverb