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Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → The fool laughs even when there's nothing to laugh at
concavatus concavata, concavatum ADJ :: hollowed out
concăvātus, a, um,1 part. de concavo2 adjt, concave : Col. Rust. 8, 5, 11.