ἀμυσχρός
From LSJ
σκληρόν σοι πρὸς κέντρα λακτίζειν → it is hard for thee to kick against the pricks, it is hard for you to kick against the goads
English (LSJ)
ά, όν, (μύσος)
A undefiled, Parth.Fr.2, prob. l. in S.Fr. 1005, cf. Hsch., EM87.26 (ἀμυχρόν Phot.p.97 R.; ἀμυχνόν, ἀμυγνόν, ἀμύσκαρον are also cited by Suid.).