IMPROBABLY

\ɪmpɹˈɒbəbli], \ɪmpɹˈɒbəbli], \ɪ_m_p_ɹ_ˈɒ_b_ə_b_l_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan