Pronunciation: [sˈɜːtənliɪŋ] (IPA)
Correct spelling for the English word "certainlying" is [sˈɜːtənliɪŋ], [sˈɜːtənliɪŋ], [s_ˈɜː_t_ə_n_l_i__ɪ_ŋ] (IPA phonetic alphabet).
Correct spelling for certainlying