ἀδιαλλάκτως

From LSJ

ὁ μὴ πεπλευκὼς οὐδὲν ἑόρακεν κακόν → anyone who hasn't sailed has never seen trouble

Source

Russian (Dvoretsky)

ἀδιαλλάκτως: непримиримо (ἀ. ἔχειν πρός τινα Plut.).

Spanish

irreconciliablemente