Meaning & use
nullify
To make something legally void or without effect; to cancel out the force or validity of something.
See it in a sentence
The court moved to nullify the contract after discovering it had been signed under duress.
A single penalty can nullify hours of careful strategic planning in a match.
A note on using this word
Nullify most often applies to legal or official actions, though it also works figuratively for canceling out any effect.
Words with a similar meaning
voidinvalidate
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
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