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Wilful
Negative Connotation
Using 'wilful' suggests a negative judgment about someone's actions being intentional, often related to wrongdoings. 
Legal Implications
In legal contexts, 'wilful' implies that an act was done with intention and can affect the severity of punishment. 
Emotional Impact
When someone's actions are described as 'wilful', it often triggers emotions like frustration or disapproval in others. 