PERTINACIOUSLY

\pˌɜːtɪnˈe͡ɪʃəsli], \pˌɜːtɪnˈe‍ɪʃəsli], \p_ˌɜː_t_ɪ_n_ˈeɪ_ʃ_ə_s_l_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd