ἀϊδήλως
From LSJ
ἀεὶ δ' ἀρέσκειν τοῖς κρατοῦσιν → always try to please your masters, always be obsequious to the masters
French (Bailly abrégé)
adv.
d'une manière funeste.
Étymologie: ἀΐδηλος.
Russian (Dvoretsky)
ἀϊδήλως: губительно, беспощадно (κτείνειν Hom.).