nastiness

There's no need for such nastiness in a professional environment.

プロの環境でそのような卑劣さは必要ない。

That was a nasty fall—are you okay?

ひどい転び方だったね—大丈夫？

I was shocked by the nastiness of his comments.

彼のコメントの意地悪さに私はショックを受けた。

Don't be so nasty to your little sister.

妹にそんなに意地悪しないで。

He got a nasty gash on his leg from falling on the rocks.

彼は岩に落ちて足にひどい深い切り傷を負った。