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αυθαδικός

Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ -> The fool laughs even when there's nothing to laugh at
Menander

Greek Monolingual

αὐθαδικὸς, -ή, -όν (Α) αυθάδης
αυτός που έχει αυθάδη, αγέρωχο τρόπο.