mischievous
adjective uk/ˈmɪs.tʃɪ.vəs/ us/ˈmɪs.tʃə.vəs/
（人、行为等）爱恶作剧的，好捣乱的，顽皮的，淘气的
behaving in a way, or describing behaviour, that is slightly bad but is not intended to cause serious harm or damage
She has a mischievous sense of humour. 她很幽默，喜欢搞点恶作剧。
a book about the mischievous antics of his ten-year-old daughter 一本有关他10岁女儿顽皮行为的书
恶意的
expressing or suggesting mischief
a mischievous grin 不怀好意的狞笑
（行为）有害的;（话语）恶意中伤的
used to describe behaviour or words that are intended to cause harm or trouble
I think these rumours are mischievous. 我认为这些流言是恶意中伤。