βοηθητέος

From LSJ

ἀμήχανον δὲ παντὸς ἀνδρὸς ἐκμαθεῖν ψυχήν τε καὶ φρόνημα καὶ γνώμην, πρὶν ἂν ἀρχαῖς τε καὶ νόμοισιν ἐντριβὴς φανῇ → hard it is to learn the mind of any mortal or the heart, 'till he be tried in chief authority | it is impossible to know fully any man's character, will, or judgment, until he has been proved by the test of rule and law-giving

Source

French (Bailly abrégé)

α, ον :
adj. verb. de βοηθέω.

Spanish (DGE)

-α, -ον
que debe ser ayudadoἀνήρ Iul.Or.7.229a, cf. Gr.Naz.Ep.104.3.

Middle Liddell

βοηθέω
one must help, Xen., Dem.