IELTS Anvil

invalid

CEFR: B2

Not legally binding, officially unacceptable, or factually null and void due to procedural error or prior art.

Synonyms

null and void
inoperative
unfounded

Common Collocations

render invalid
invalid argument
null and void

Example Sentence

The court declared the rival patent claim invalid because prior experiments had already been documented in published journals.

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