PAINSTAKINGNESS

\pˈe͡ɪnste͡ɪkɪŋnəs], \pˈe‍ɪnste‍ɪkɪŋnəs], \p_ˈeɪ_n_s_t_eɪ_k_ɪ_ŋ_n_ə_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd