The credit card was invalid; it was not approved at checkout.
the little boy in the wheel chair is an invalid person. Invalid means sick, disabled, or diseased person
An example of a homograph for the word "invalid" is: "She received an invalid excuse from her brother." In this sentence, "invalid" is pronounced with the stress on the second syllable.
Example sentence - The ticket was invalid because the expiration date had passed.
Like telling someone.. "Is an invalid sentence." would be incorrect. "That is an invalid sentence." would be correct.
The premises on which he based his conclusions were invalid.
My neighbor is an invalid.
I forgot to renew my licence and now it is invalid.
The certificates was invalidated by the superiors
The word invalid is an adjective. It describes something that is not valid.
The old man was an invalid; he could no longer take care of himself.
Yes, it can be challenged if the word is actually invalid.
She signed the contract under duress, fearing the consequences if she did not comply with the demands.