Behaving in a way, or describing behaviour, that is slightly bad but is not intended to cause serious harm or damage: (Cambridge Dictionary)
Expressing or suggesting mischief. (Cambridge Dictionary)
Used to describe behaviour or words that are intended to cause harm or trouble. (Cambridge Dictionary)
Able or tending to cause annoyance, trouble, or minor injury. (Merriam – Webster)
Irresponsibly playful. (Merriam – Webster)
A mischievous person likes to have fun by playing harmless tricks on people or doing things they are not supposed to do. (Collins Dictionary)
A mischievous act or suggestion is intended to cause trouble. (Collins Dictionary)
Causing or showing a fondness for causing trouble in a playful way. (Oxford Dictionaries)
Mischievous guy cartoon vector image.
How to be mischievous.