IRRESPONSIBILITY

\ɪɹɪspˌɒnsəbˈɪlɪti], \ɪɹɪspˌɒnsəbˈɪlɪti], \ɪ_ɹ_ɪ_s_p_ˌɒ_n_s_ə_b_ˈɪ_l_ɪ_t_i]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.