UNTHINKABLE

\ʌnθˈɪŋkəbə͡l], \ʌnθˈɪŋkəbə‍l], \ʌ_n_θ_ˈɪ_ŋ_k_ə_b_əl]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd