形容词

1. 不仁慈的；不友善的；不厚道的；刻薄的
If someone is unkind, they behave in an unpleasant, unfriendly, or slightly cruel way. You can also describe someone's words or actions as unkind .

1. deficient in humane and kindly feelings

Synonym: pitiless

2. lacking kindness

e.g. a thoughtless and unkind remark
the unkindest cut of all