Definition of "wicked"

wicked¹

/ˈwɪkɪd/

adjective
comparative wickeder or more wicked, superlative wickedest or most wicked
1. Evil or mischievous by nature.
  Quotations
  The wicked flee when no man pursueth: but the righteous are bolde as a lyon.
  1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], Proverbs 28:1
  ‘[…] I remember a lady coming to inspect St. Mary's Home where I was brought up and seeing us all in our lovely Elizabethan uniforms we were so proud of, and bursting into tears all over us because “it was wicked to dress us like charity children”. […]’.
  1963, Margery Allingham, chapter 6, in The China Governess‎
  What a wicked game to play, to make me feel this way / What a wicked thing to do, to let me dream of you / What a wicked thing to say, you never felt this way
  1989, Chris Isaak (lyrics and music), “Wicked Game”, in Heart Shaped World
2. (slang) Excellent; awesome; masterful.
3. Harsh; severe.
adverb
not comparable
1. (slang, New England, Britain) Very, extremely.

wicked²

/wɪkt/

verb
1. simple past and past participle of wick
adjective
not comparable
1. Having a wick.
  Quotations
  Up went Moggy, with her thick-wicked kitchen candle, to seek repose; […]
  1863, Sheridan Le Fanu, The House by the Churchyard

wicked³

/ˈwɪkɪd/

adjective
1. (UK, dialect, obsolete) Active; brisk.
2. (Britain, dialect, chiefly Yorkshire) Infested with maggots.
3. Alternative form of wick, as applying to inanimate objects only.