FOUL-PROOF

\fˈa͡ʊlpɹˈuːf], \fˈa‍ʊlpɹˈuːf], \f_ˈaʊ_l_p_ɹ_ˈuː_f]\
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1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.