annul

This term carries a heavy legal and formal weight, implying a retroactive erasure of validity. It suggests that the agreement or law was either fundamentally flawed from the start or has been officially stripped of its power by a higher authority, rendering it as if it never existed. In a non-legal sense, it describes the act of neutralizing an effect. When one force annuls another, it creates a state of zero impact, effectively wiping out the advantages or consequences of a previous action.