Definition of willy-nilly adverb from the Oxford Advanced American Dictionary

     

    willy-nilly

     adverb
    adverb
    NAmE//ˌwɪli ˈnɪli//
     
    (informal)
     
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  1. 1 in a careless way without planning Don't use your credit card willy-nilly.
  2. 2whether you want to or not She was forced willy-nilly to accept the company's proposals.
See the Oxford Advanced Learner's Dictionary entry: willy-nilly