I looked up mischievous in the dictionary and this is what I found...

mis·chie·vous  (msch-vs)

adj.

1. Causing mischief.

2. Playful in a naughty or teasing way.

3. Troublesome; irritating: a mischievous prank.

4. Causing harm, injury, or damage: mischievous rumors and falsehoods.

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[Middle English mischevous, from mischef, mischief; see mischief.]

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mischie·vous·ly adv.

mischie·vous·ness n.