willy- nilly

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.
         [1913 Webster]

   {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.
      [1913 Webster]
    

Willy nilly \Wil"ly nil"ly\
   Whether I (he, she, they) want to or not. See {Will I, nill
   I}, etc., under 3d {Will}.
   [1913 Webster]
    

49 Moby Thesaurus words for "willy nilly":
      all over, all over hell, at intervals, brokenly, by catches,
      by fits, by jerks, by skips, by snatches, come what may,
      compulsorily, disconnectedly, discontinuously, every which way,
      fitfully, from necessity, haphazardly, harum-scarum, helplessly,
      helter-skelter, here and there, higgledy-piggledy, hugger-mugger,
      in a jumble, in a mess, in a muddle, in confusion, in disarray,
      in disorder, in spots, inescapably, inevitably, infrequently,
      intermittently, necessarily, need, needfully, needs, nolens volens,
      occasionally, of necessity, per saltum, perforce, randomly,
      requisitely, skimble-skamble, skippingly, unavoidably,
      without choice