A.unchangeable, opp. “παθητός, οὐσία” Chrysipp.Stoic. 2.158; unmoved, inflexible, Arist.Mu.401b19; irreparable, “φόνος” A.R. 4.704; “Μοῖρα” IG9(2).317, cf. 14.1839; “ἀτρέπτους κἀπαραιτήτους” Phld. D.1.18; “ἄ. τὸ πρόσωπον” Luc.VH2.23; “ἄ. πρὸς κινδύνους” J.BJ7.8.7; πρὸς τὸ κακῶς ἀκούειν indifferent to ill-repute, not caring, Plu.Alc.13. Adv. “-τως” Ph.2.87, J.BJ7.9.1; without hesitation, D.S.34.2, Ael. NA17.17:—also ἀτρεμ-πτί , Hdn.Epim.256.
II. Medic., of food, undigested, Aret.SD1.16, Gal.16.800.