INEFFECTIVENESS

\ɪnɪfˈɛktɪvnəs], \ɪnɪfˈɛktɪvnəs], \ɪ_n_ɪ_f_ˈɛ_k_t_ɪ_v_n_ə_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd