1. 顽皮地：naught 无 | naughtily 顽皮地 | naughty 顽皮的

2. 无礼地/顽皮地/粗暴地：naught /无/空/零/ | naughtily /无礼地/顽皮地/粗暴地/ | naughtiness /无礼/顽皮/粗暴/

3. 顽皮地; 粗鲁地; 无礼地; 不妥地 (副)：naught 无, 零 (名) | naughtily 顽皮地; 粗鲁地; 无礼地; 不妥地 (副) | naughtiness 顽皮, 淘气 (名)

adv

1. in a disobedient or naughty way

e.g. 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

Synonym: badlymischievously