1. the quality or state of being devilish; mischievous or playfully wicked behavior
Usage: often used to describe lighthearted or impish conduct rather than truly evil behavior
2. extreme wickedness or cruelty; malevolent or evil nature
Usage: less common than the playful sense; conveys serious moral wrongdoing

Examples

• The children's devilishness was evident when they hid their teacher's chalk.
• She had a devilishness in her smile that suggested she was up to something fun.
• His devilishness knew no bounds as he played pranks on everyone at the party.
• The character's devilishness made him both charming and unpredictable.
• There was a hint of devilishness in how he answered the trick question.
• Her devilishness came through in the mischievous glint in her eye.