ἀπορρᾳθυμήτως

From LSJ

Ψεύδει γὰρ ἡ ‘πίνοια τὴν γνώμην → A second thought proves one's first thought false

Sophocles, Antigone, 389

Spanish (DGE)

adv. sin resistencia ἔχειν Iul.Or.4.252a.