If you describe someone or something as wicked, you mean that they are rather naughty, but in a way that you find attractive or enjoyable. She had a wicked sense of humour
Evil in principle or practice; deviating from morality; contrary to the moral or divine law; addicted to vice or sin; sinful; immoral; profligate; said of persons and things; as, a wicked king; a wicked woman; a wicked deed; wicked designs
You use wicked to describe someone or something that is very bad and deliberately harmful to people. She described the shooting as a wicked attack She flew at me, shouting how wicked and evil I was. = evil
intensely or extremely bad or unpleasant in degree or quality; "severe pain"; "a severe case of flu"; "a terrible cough"; "under wicked fire from the enemy's guns"; "a wicked cough"