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Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → The fool laughs even when there's nothing to laugh at
adj.
Use P. and V. οἰκούμενος, V. ἐξοικήσιμος. The habitable globe: P. ἡ οἰκουμένη.