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Discover LudwigThe phrase "a invalid" is not correct in written English.
The correct form is "an invalid" because "invalid" begins with a vowel sound.
Example: "The document was deemed an invalid submission due to missing signatures."
Alternatives: "an erroneous" or "a null".
Exact(2)
A: Invalid question.
Note that when using Firefox, when you first visit the page you may get a Invalid Certificate message.
Similar(58)
Carrying a concealed weapon with an invalid permit is a felony offense in many states.
Mrs. Chaffee, an invalid, had an elaborate bathroom, fit for a princess.
Her practical and affectionate mother, who was an invalid, was a positive influence.
His father was an invalid, with a wound in his hip, and he was bedridden.
But Mr. Roberts said drawing the line between a valid and an invalid ballot was delicate.
* If y is an invalid character, an error of type reader-error is signaled.
He spent the last three decades of his life a recluse and often an invalid.
Mrs. H. had fallen from it's back during a seizure, and became an invalid.
He had to lay down his arms after a stroke made him an invalid.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com