Not to will; not to wish.
Nill is defined as to be unwilling or to refuse.
An example of nill is when a horse refuses to walk forward.
To be unwilling; will not.
Not to will (something); refuse.
Will I, nill I.
1600, Edward Fairfax, The Jerusalem Delivered of Tasso, XII, lxi.
What I nill tell you ask (quoth she) in vain,Nor mov'd by prayer, nor constrain'd by power.
Shining sparks thrown off from melted brass.
Scales of hot iron from the forge.