ἀδυναμέω
From LSJ
πείθεται πᾶς ἥδιον ἢ βιάζεται (Dio Cassius, Historiae Romanae 8.36.3) → it's always more pleasant to be persuaded than to be forced
English (LSJ)
to want power, be incapable, LXX Si.Prol., Simp.in Cael. 139.24: c. inf., PLond.2.361r8 (i A. D.).
Spanish (DGE)
(ἀδῠνᾰμέω)
ser incapaz, no poder ἀ. ἐν τῷ λέγειν ser inhábil en el hablar e.e. carecer del don de la palabra E.Fr.928b, cf. LXX Si.praef.
•c. inf. γεωργῆσαι POxy.2873.8 (I d.C.).
Greek (Liddell-Scott)
ἀδυναμέω: δὲν ἔχω δύναμιν, δὲν εἶμαι ἱκανός, Ἑβδ. (Σειράχ. ἐν προλόγῳ).