κλαικτός

From LSJ

Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → The fool laughs even when there's nothing to laugh at

Menander

Greek (Liddell-Scott)

κλαικτός: κλειστός, Ἐπιγραφ. Ἀνδ. 94.