Pronunciation: [stɹˈɛŋθɪə] (IPA)
Correct spelling for the English word "strengthier" is [stɹˈɛŋθɪə], [stɹˈɛŋθɪə], [s_t_ɹ_ˈɛ_ŋ_θ_ɪ__ə] (IPA phonetic alphabet).
Correct spelling for strengthier