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τεθνάμεν

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

French (Bailly abrégé)

inf. pf. épq. sync. de θνῄσκω.

Russian (Dvoretsky)

τεθνάμεν: (αι) эп. inf. pf. к θνῄσκω.