γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → the fool laughs even when there's nothing to laugh at
P. and V. σχολαῖος (Soph., Fragment).
slow: P. and V. βραδύς.
in a leisurely way: Ar. and P. καθ' ἡσυχίαν.
