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Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → The fool laughs even when there's nothing to laugh at
λεῖος, ἄβολος, νεοθηλής, νεοθαλής, κουρόσυνος, νεαλής, νέος, νεανίας, νεηνίης, νεαρός, κουρότερος, νεόπηκτος, νεόγυιος, πρόσφατος, νεόδμητος, ἀνθηρός, νεανικός