Synonyms of 'impish'
mischievousDictionary, devilish, roguishHe is known for his impish sense of humour.
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If you describe someone as elfin, you think that they are attractive because they are small and have delicate features.
Wilfred gave him a mischievous, elfin grin.
If you describe someone as puckish, you mean that they play tricks on people or tease them.
He had a puckish sense of humour.
Thesaurus for impish from the Collins English Thesaurus
If you describe someone or their behaviour as impish , you mean that they are rather disrespectful or naughty in a playful way.