ἐνεδρευτός

From LSJ

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

Source

Spanish (DGE)

-όν
intrigante, insidioso de pers., Timaeus en Cat.Cod.Astr.1.98.27.