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