mischievous
1. [ adjective ] badly behaved
Synonyms: naughty
Examples:

"he was saucy and mischievous in school" "a naughty boy"

Related terms: bad
2. [ adjective ] naughtily or annoyingly playful
Synonyms: implike puckish prankish pixilated impish
Examples:

"teasing and worrying with impish laughter"

Related terms: playful
3. [ adjective ] deliberately causing harm or damage
Examples:

"mischievous rumors and falsehoods"

Related terms: harmful
Similar spelling:   mischievously