ἀμετάστρεπτος

ον, Adv.
A. not to be diverted, Max.Tyr. 11.5, cf. POxy. 705.62. Adv. ἀμετα‐στρεπτί [ι‐] or ‐εί without turning round, straight forward, φεύγειν X. Smp. 4.50, Pl. Lg. 854c, cf. R. 620e, Ph. 1.517, M.Ant. 8.5 (v.l. ‐τρεπτί), etc.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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