Definition of implacable adjective from the Oxford Advanced American Dictionary

     

    implacable

     adjective
    adjective
    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 someone or something an implacable enemy She remained implacable (= she would not change her feelings and opinions).
NAmE//ɪmˈplækəbli//
 
adverb to be implacably opposed to the plan
See the Oxford Advanced Learner's Dictionary entry: implacable