mischievous

Synonyms: arch artful bad bothersome damaging dangerous deleterious destructive detrimental dickens evil exasperating foxy frolicsome harmful hazardous holy terror hurtful ill ill-behaved impish injurious insidious irksome malicious malignant misbehaving naughty nocuous perilous pernicious playful precarious puckish rascal rascally risky rude sinful sly spiteful sportive teasing tricky troublesome vexatious vexing vicious wayward

Antonyms: behaved good nice obedient