Use 'nullify' to indicate something is completely without legal force or binding power. The new law will effectively nullify earlier agreements.
Pro Tip 2/3
No Simple Cancellation
'Nullify' suggests an action is made invalid, typically through legal or formal means, not merely cancelled. The amendment may nullify previous regulations.
Pro Tip 3/3
Irrelevance by Nullification
When 'nullify' is used, it emphasizes that the thing being nullified should no longer be considered relevant. Their objections were nullified by the committee's unanimous decision.