Lewis & Short

phĭlŏsŏphĭcus, a, um, adj., = φιλοσοφικός, of or belonging to philosophy, philosophic (post-class.; for the proper read., Cic. Tusc. 5, 41, 121, is philosophiae, acc. to Non. 134, 3, and 174, 18), Macr. S. 7, 1 Eyssen. (Jan. philosophis); Ambros. Off. 2, 9, 49; Sid. Ep. 4, 1.
Adv.: phĭlŏsŏphĭcē, in a philosophical manner, philosophically: vivere, Lact. 3, 14, 19.