Definition of implacable adjective from the Oxford Advanced Learner's Dictionary

     

    implacable

     adjective
    adjective
    BrE BrE//ɪmˈplækəbl//
     
    ; NAmE NAmE//ɪmˈplækəbl//
     
     
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  1. 1(of strong negative opinions or feelings) that cannot be changed implacable hatred
  2. 2(of a person) unwilling to stop opposing somebody/something an implacable enemy She remained implacable (= she would not change her feelings and opinions).
  3. Word Origin late Middle English: from Latin implacabilis, from in- ‘not’ + placabilis (from placare ‘appease’).
See the Oxford Advanced American Dictionary entry: implacable