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.
双语例句
例： All last summer he'd been unkind to her.
去年整个夏天他一直对她很不友好。
例： No one has an unkind word to say about him.
没有人说过他一句坏话。