ἀφιλανθρώπητος

From LSJ

γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → the fool laughs even when there's nothing to laugh at

Source

Spanish (DGE)

-ον
falto de sentimientos humanitarios, desconsiderado, BGU 1785.10 (I a.C.).