Definition of willy-nilly adverb from the Oxford Advanced Learner's Dictionary

     

    willy-nilly

     adverb
    adverb
    BrE BrE//ˌwɪli ˈnɪli//
     
    ; NAmE NAmE//ˌwɪli ˈnɪli//
     
    (informal)
     
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  1. 1whether you want to or not She was forced willy-nilly to accept the company's proposals.
  2. 2in a careless way without planning Don't use your credit card willy-nilly.
  3. Word Origin early 17th cent.: later spelling of will I, nill I ‘I am willing, I am unwilling’.
See the Oxford Advanced American Dictionary entry: willy-nilly