he mischievously looked for a chance to embarrass his sister.
Examples of mischievously
mischievously
Mr Obama still mischievously acknowledges his debt to Mr Romney from time to time.
From the economist.com
Asked about the government's program to collect weapons, he grinned mischievously.
From the nytimes.com
His face was a pale Russian winter's landscape, his blue eyes shone mischievously.
From the time.com
QuackGurus interpretation of WP rules is consistently and mischievously wrong.
From the en.wikipedia.org
I ask if it was a relief to discover he could, and he grins mischievously and nods.
From the guardian.co.uk
Skvorecky was wry, humane and always mischievously alert to the human comedy.
From the guardian.co.uk
Ravi smiled innocently but mischievously, apologised and didn't do it again.
From the guardian.co.uk
At one point he smiled mischievously, goading the protesters to sing louder.
From the time.com
Mischievously, Lucas insisted that Craig and Charlie drag-up as old ladies.
From the independent.co.uk
More examples
Badly: in a disobedient or naughty way; "he behaved badly in school"; "he mischievously looked for a chance to embarrass his sister"; "behaved naughtily when they had guests and was sent to his room"
(mischievous) arch: naughtily or annoyingly playful; "teasing and worrying with impish laughter"; "a wicked prank"
(mischievous) deliberately causing harm or damage; "mischievous rumors and falsehoods"
Mischief is a vexatious or annoying action, or, conduct or activity that playfully causes petty annoyance. Young children, when they hear of mischief, think of practical jokes.