Etymology
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mischievous (adj.)

early 14c., "unfortunate, disastrous, miserably, wretchedly," probably from mischief + -ous. Sense of "playfully malicious or annoying" is attested by 1670s. "The stressing on the second syllable was common in literature till about 1700; it is now dialectal, vulgar, and jocular" [OED]. Related: Mischievously; mischievousness.

updated on January 27, 2019

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Definitions of mischievous from WordNet

mischievous (adj.)
naughtily or annoyingly playful;
Synonyms: arch / impish / implike / pixilated / prankish / puckish / wicked
mischievous (adj.)
deliberately causing harm or damage;
mischievous rumors and falsehoods
From wordnet.princeton.edu, not affiliated with etymonline.