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Nullify (Verb)

Declare invalid; "The contract was annulled"; "void a plea".

Verbs of political and social activities and events.

Make ineffective by counterbalancing the effect of; "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts".

Verbs of size, temperature change, intensifying, etc..

Show to be invalid.

Verbs of thinking, judging, analyzing, doubting.