ENFEEBL

\ɛnfˈiːbə͡l], \ɛnfˈiːbə‍l], \ɛ_n_f_ˈiː_b_əl]\
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1894 - The Clarendon dictionary
By William Hand Browne, Samuel Stehman Haldeman
 
1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald