mischief的意思是淘氣;惡作劇;頑皮;惡意;使壞的念頭;傷害;毀損。
牛津詞典：
noun
[U]
1、淘氣；惡作劇；頑皮。
bad behaviour (especially of children) that is annoying but does not cause any serious damage or harm.
Those children are always getting into mischief .
那些孩子總是淘氣。
I try to keep out of mischief .
我盡量不胡鬧。
It's very quiet upstairs; they must be up to some mischief !
樓上很安靜。他們壹定在搞什麽惡作劇。
2、惡意；使壞的念頭。
the wish or tendency to behave or play in a way that causes trouble.
Her eyes were full of mischief.
她眼睛裏滿是使壞的神情。
3、(formal)?傷害；毀損。
harm or injury that is done to sb or to their reputation.
The incident caused a great deal of political mischief.
這壹事件造成了嚴重的政治危害。