Lewis & Short

com-mĭsĕresco, ĕre, 3, v. inch. a., to commiserate, have sympathy with (anteclass.): servos, Enn. ap. Non. p. 472, 29 (Trag. v. 222 Vahl.): Priamus si adesset, ipse ejus commiseresceret, Pac. ap. Serv. ad Verg. A. 11, 259 (Trag. Rel. v. 391 Rib.): ut illius conmiserescas miserulae orbitudinis, Turp. ap. Non. p. 146, 18 (Com. Rel. v. 211 ib.).
Impers., with acc. pers. and gen. rei: Bacchidem ejus commiseresceret, Ter. Hec. 1, 2, 54.