Ask at the forum if you have an Ancient or Modern Greek query!
Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → The fool laughs even when there's nothing to laugh at
ὑποκοριστικόν, ὑποκόρισμα, ὑποκορισμός
