willy-nilly
adverb /ˌwɪli ˈnɪli/
  /ˌwɪli ˈnɪli/
(informal)- whether you want to or not- She was forced willy-nilly to accept the company's proposals.
 
- in a careless way without planning- Don't use your credit card willy-nilly.
 
Word Originearly 17th cent.: later spelling of will I, nill I ‘I am willing, I am unwilling’.