Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: will I nill I '(whether) I am willing (or) I am unwilling'; nill 'to be unwilling' (11-19 centuries), from Old English nyllan, from ne 'not' + wyllan ( WILL1)

willy-nilly

adverb
     
willy-nil‧ly
1 if something happens willy-nilly, it happens whether you want it to or not:
He found himself drawn, willy-nilly, into the argument.
2 without planning, organization, or control:
Companies were accused of raising prices willy-nilly.

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