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απερίσκεπτος

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

Greek Monolingual

κ. απερίσκεφτος, -η, -ο (AM ἀπερίσκεπτος, -ον)
ασυλλόγιστος, αστόχαστος.