OBSTINATENESS

\ˈɒbstɪnˌe͡ɪtnəs], \ˈɒbstɪnˌe‍ɪtnəs], \ˈɒ_b_s_t_ɪ_n_ˌeɪ_t_n_ə_s]\
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1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.
 
1871 - The Cabinet Dictionary of the English Language