Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → The fool laughs even when there's nothing to laugh at
P. ἐπιτελής, P. and V. τέλειος (rare P.). τέλεος (rare P.), V. ἐκτελής, τελεσφόρος.