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κατόν

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

Greek (Liddell-Scott)

κατόν: κατὰ τὸν (ὡς καὶ καττόν), Ἐπιγρ., Ἀρκαδ., Φωκ., Βοιωτ. καὶ ἄλλ., πρβλ. κατάς, καττάς, κατούς.