Mischievous
/mˈɪstʃəvəs/
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Definition
(adj) Causing mischief; injurious.
Sentence Examples
It is true the boy is mischievous, but he is kind at heart.
Keep an eye on the boys. They're mischievous.
CEFR Practice Quiz
The boy gave his mother a ____ grin, making her realize that he had probably finished all the homemade chocolate cookies.