ἀναπότρεπτος

From LSJ

εἰργάζοντο λογάδην φέροντες λίθους καὶ ξυνετίθεσαν ὡς ἕκαστόν τι ξυμβαίνοι → they went to work bringing the stones as they picked them out and put them together as each one happened to fit

Source

Spanish (DGE)

-ον
firme, irrevocable γνώμη PMasp.98.4 (VI d.C.)
como glos. a ἀλίαστος Sch.Er.Il.2.797 (p.170).