"Willy-nilly" is an idiomatic expression that means "whether one wants to or not" or "in a haphazard or disorganized manner." It can imply doing something without having a choice in the matter or being forced to go along with something. It can also refer to a situation where actions are taken carelessly or without proper planning. For example, someone might say, "They had to move willy-nilly when they found out their lease was ending.
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