ἀπιθάνως

From LSJ

κεντέω τὸν πῶλον περὶ τὴν νύσσαν → of impetuous haste, goad the foal around the turning post

Source

French (Bailly abrégé)

adv.
sans vraisemblance.
Étymologie: ἀπίθανος.

Spanish

no persuasivamente, con rudeza

Russian (Dvoretsky)

ἀπιθάνως: неправдоподобно, неубедительно Isocr., Plut.