INCONCEIVABLE

\ɪnkənsˈiːvəbə͡l], \ɪnkənsˈiːvəbə‍l], \ɪ_n_k_ə_n_s_ˈiː_v_ə_b_əl]\
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1919 - The Winston Simplified Dictionary
By William Dodge Lewis, Edgar Arthur Singer
 
1899 - The american dictionary of the english language.
By Daniel Lyons
 
1894 - The Clarendon dictionary
By William Hand Browne, Samuel Stehman Haldeman
 
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan