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moroso

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

Spanish > Greek

moroso = ἀγνωμονέω, ἀγνώμων

* Look up in: Google | Wiktionary | Wikcionario (Translation based on the reversal of DGE)