Pronunciation: [d͡ʒˈɔ͡ɪntliə] (IPA)
Correct spelling for the English word "jointlier" is [d͡ʒˈɔ͡ɪntliə], [dʒˈɔɪntliə], [dʒ_ˈɔɪ_n_t_l_i__ə] (IPA phonetic alphabet).
Correct spelling for jointlier