UNAPPRECIATIVE

\ʌnɐpɹˈiːʃi͡ətˌɪv], \ʌnɐpɹˈiːʃi‍ətˌɪv], \ʌ_n_ɐ_p_ɹ_ˈiː_ʃ_iə_t_ˌɪ_v]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd