Nill is defined as to be unwilling or to refuse.
(verb)An example of nill is when a horse refuses to walk forward.
See nill in Webster's New World College Dictionary
transitive verb, intransitive verb
Origin: ME nillen < OE nyllan < ne, not (see no) + willan (see will)
See nill in American Heritage Dictionary 4
verb nilled, nill·ing, nills
Origin:
Origin: Middle English nilen
Origin: , from Old English nyllan
Origin: : ne, not; see ne in Indo-European roots
Origin: + willan, to desire; see wel-1 in Indo-European roots
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