(of strong negative opinions or feelings 强烈的消极看法或感情 that cannot be changed 不能改变的 implacable hatred 难以化解的仇恨
(of a person 人 unwilling to stop opposing somebody/something 不愿和解的；不饶人的 an implacable enemy 死敌 She remained implacable (= she would not change her feelings and opinions). 她仍然不死心。
Word Originlate Middle English: from Latin implacabilis, from in- ‘not’ + placabilis (from placare ‘appease’).