IMPLACABILITY
\ɪmplˌe͡ɪsəbˈɪlɪti], \ɪmplˌeɪsəbˈɪlɪti], \ɪ_m_p_l_ˌeɪ_s_ə_b_ˈɪ_l_ɪ_t_i]\
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By Noah Webster.
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n. Unappeasable wrath ; irreconcilable emnity ; inexorable disposition : - also implacableness.
By Thomas Sheridan