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Definitions
Wiktionary
- adv. Whether desired or not.
- adv. Without regard for consequences or the will of those affected.
- adv. Seemingly at random, haphazardly
GNU Webster's 1913
- Whether I (he, she, they) want to or not. See Will I, nill I, etc., under 3d will.
Examples
“Gone is the undertow of spring's willy nilly presentation.”
The Huffington Post: Jack Schimmelman: Central Park: A Performance in Four Seasons (Summer)
Lists
These user-created lists contain the word ‘willy nilly’.

jmjarmstrong JM, in a shilly-shallying, vacillating way, rushed about all over the place until he settled upon 'willy nilly' as the mood of the day Feb 1, 2009