Expressing or showing passion; passionate.Full of pathos; affecting or moving the feelings; exciting pity, sorrow, grief, or other tender emotion; affecting: as, a pathetic song or discourse; pathetic expostulation.In anatomy, trochlear: in designation of or reference to the fourth crania1 nerve.n. A trochlear or pathetic nerve; a patheticus.Trochlear: in reference to the superior oblique muscle.n. Same as patheticus, 2.