UNPARDONABLE

\ʌnpˈɑːdə͡ʊnəbə͡l], \ʌnpˈɑːdə‍ʊnəbə‍l], \ʌ_n_p_ˈɑː_d_əʊ_n_ə_b_əl]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd