ἀδαηστί

From LSJ

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

Sophocles, Antigone, 651-2

Spanish (DGE)

adv. de forma ignorante Zonar.p.49.