Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† mōrŏlŏgus, a, um, adj., = μωρολόγος, speaking foolishly, foolish (Plautinian): sermones, Plaut. Ps. 5, 1, 20.
As subst., a fool: tibi morologus fio, Plaut. Pers. 1, 1, 50.