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ἔσσεσθαι

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

French (Bailly abrégé)

p. élis. ἔσσεσθ’;
inf. fut. épq. de εἰμί.

Greek Monotonic

ἔσσεσθαι: Επικ. αντί ἔσεσθαι, απαρ. μέλ. του εἰμί (sum).