na-adjective, noun
mean; nasty; malicious; unkind
Describes a person, action, or attitude that is deliberately unkind or spiteful. Often used for teasing, bullying, or petty cruelty.
彼は弟に意地悪なことを言った。
He said something mean to his younger brother.
そんな意地悪しないでよ。
Don't be so mean.