kind的形容詞的反義詞：unkind；
unkind
adj. 不友善的，不親切的；刻薄的；（天氣）惡劣的
例句：
Its not in his nature to be unkind.
他天生不會(huì)刻薄。
He was never actually unkind to them.
其實(shí)他從沒有對(duì)他們不好。