Correct spelling for the English word "Stenchy" is [stˈɛnt͡ʃi], [stˈɛntʃi], [s_t_ˈɛ_n_tʃ_i] (IPA phonetic alphabet).
Having an offensive smell.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.