Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → The fool laughs even when there's nothing to laugh at
subs.
P. βλάξ, ὁ or ἡ, or use adj., P. and V. ἄνους, ἄφρων, μῶρος; see foolish.