IMPROBABLENESS

\ɪmpɹˈɒbəbə͡lnəs], \ɪmpɹˈɒbəbə‍lnəs], \ɪ_m_p_ɹ_ˈɒ_b_ə_b_əl_n_ə_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd