Definitions of wicked:

• adjective:   morally bad in principle or practice
• adjective:   highly offensive; arousing aversion or disgust

  Example: "A wicked stench"

• adjective:   morally bad or wrong
• adjective:   intensely or extremely bad or unpleasant in degree or quality

  Example: "Under wicked fire from the enemy's guns"

• adjective:   having committed unrighteous acts