unkind [ʌnˈkaɪnd]
adjective
unkinder (comparative)unkindest (superlative)1 (cruel, nasty) [+person] poco amable; (stronger) cruel; [+criticism] duro; [+remark] cruel; [+words] desagradable
that was very unkind of him eso fue muy poco amable de su parte; I've never known him to be unkind nunca ha sido desagradable, que yo sepa; she never has an unkind word to say about anyone nunca dice nada malo de nadie
it would be unkind to say that ... sería cruel decir que ...; to be unkind to sb portarse mal con algn