merciless

merciless
[ˈmɜːsɪlɪs]
adjetivo
1despiadado(a)

merciless [mer-si-les]
adjetivo
1Cruel, inhumano, desalmado; sin misericordia, sin clemencia.

merciless [ˈmɜːsɪlɪs]
adjective
[+person, attack] despiadado; cruel; [+killing, beating] cruel; [+sun, heat] implacable
he's famous for his merciless treatment of hecklers tiene fama de tratar despiadadamente a los que interrumpen con preguntas o comentarios molestos
the merciless Alabama sun to be merciless [towards] sb