λαγῷ

From LSJ

Τί γὰρ γένοιτ' ἂν ἕλκος μεῖζονφίλος κακός; → What wound is greater than a false friend?

Sophocles, Antigone, 651-2

Russian (Dvoretsky)

λᾰγῷ: dat. к λαγώς.