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λίασθεν

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

French (Bailly abrégé)

3ᵉ pl. épq. ao. Pass. de λιάζομαι.

Russian (Dvoretsky)

λίασθεν: эп. 3 л. pl. aor. pass. к λιάζομαι.