willy-nilly

[ wil-ee-nil-ee ]
/ ˈwɪl iˈnɪl i /

adverb

in a disorganized or unplanned manner; sloppily.
whether one wishes to or not; willingly or unwillingly: He'll have to do it willy-nilly.

adjective

shilly-shallying; vacillating.
disorganized, unplanned; sloppy: willy-nilly work.

Origin of willy-nilly

1600–10; from the phrase will ye, nill ye. See will1, nill
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for willy-nilly

willy-nilly

/ (ˌwɪlɪˈnɪlɪ) /

adverb

whether desired or not
haphazardly

adjective

occurring or taking place whether desired or not
occurring haphazardly

Word Origin for willy-nilly

Old English wile hē, nyle hē, literally: will he or will he not; nyle, from ne not + willan to will 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012