From Longman Dictionary of Contemporary Englishwilful damage/disobedience/exaggeration etcwilful damage/disobedience/exaggeration etcDELIBERATELYdeliberate damage etc, when you know that what you are doing is wrong → wilful
Examples from the Corpus
wilful damage/disobedience/exaggeration etc• He then smashed up his cell and began his detention with a three month sentence for assault and wilful damage.• Unbelievably, they were later fined for, respectively, wilful damage and assault, and obstructing the police. 