The Collaborative International Dictionary of English v.0.48:

Nill \Nill\, v. i.
   To be unwilling; to refuse to act.
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         The actions of the will are "velle" and "nolle," to
         will and nill.                           --Burton.
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   Will he, nill he, whether he wills it or not; usually
      contracted to willy-nilly.
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The Collaborative International Dictionary of English v.0.48:

Will \Will\, v. i.
   To be willing; to be inclined or disposed; to be pleased; to
   wish; to desire.
   [1913 Webster]

         And behold, there came a leper and worshiped him,
         saying, Lord if thou wilt, thou canst make me clean.
         And Jesus . . . touched him, saying, I will; be thou
         clean.                                   --Matt. viii.
                                                  2, 3.
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   Note: This word has been confused with will, v. i., to
         choose, which, unlike this, is of the weak conjugation.
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   Will I, nill I, or Will ye, hill ye, or Will he, nill
   he, whether I, you, or he will it or not; hence, without
      choice; compulsorily; -- commonly abbreviated to willy
      nilly. "If I must take service willy nilly." --J. H.
      Newman. "Land for all who would till it, and reading and
      writing will ye, nill ye." --Lowell.
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