Meaning & use
invalid
Not legally or officially acceptable, or not correct according to logic or fact.
See it in a sentence
The referee ruled the goal invalid because a player was offside.
Her passport was invalid, having expired the month before the trip.
A note on using this word
Stress falls on the first syllable for this adjective sense; the noun sense, meaning a person with a disabling illness, stresses the second syllable and is now considered outdated.
Words with a similar meaning
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
Another way to use it
2. noun
A person made weak or disabled by chronic illness or injury (now considered dated).
In the old novel, the aunt spends her final years as a bedridden invalid.
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