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τυχηρόν

From LSJ

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

Menander

Russian (Dvoretsky)

τῠχηρόν: τό случай, случайность Plut.