unkind       
adjective uk/ʌnˈkaɪnd/ us/ʌnˈkaɪnd/
B1 刻薄的;不友善的;不客气的
not treating someone very well; not considering someone's feelings
  an unkind remark 刻薄的话 
 It was unkind of you to take his toy away. 你把他的玩具拿走太不友善了。 
 - More examples
 - an unkind remark
 - It was a bit unkind of you to mention her weight.
 - That was an unkind thing to say.
 - She's not intentionally unkind - she's just a little thoughtless sometimes.
 - Don't be so unkind to your sister!