adverbium
From LSJ
πρὸς υἱὸν ὀργὴν οὐκ ἔχει χρηστὸς πατήρ → The good father does not hold anger towards his son (Chaeremon, fragment 35)
Latin > English (Lewis & Short)
ad-verbĭum: ii, n. verbum, in gram.,
I an adverb, ἐπίρρημα; acc. to Priscian's expl.: pars orationis indeclinabilis, cujus significatio verbis adicitur, p. 1003 P.; Quint. 1, 5, 48; 50; 9, 3, 53; 11, 3, 87 al.