The old man was an invalid; he could no longer take care of himself.
My neighbor is an invalid.
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 little boy in the wheel chair is an invalid person. Invalid means sick, disabled, or diseased person
The premises on which he based his conclusions were invalid.
how can you use the word content in noun and verb in a sentence
I forgot to renew my licence and now it is invalid.
Yes you can it is a noun and a verb depending on how you use it
The credit card was invalid; it was not approved at checkout.
its a noun
As a noun.
The cracks in the wall were expanding, indicating a structural problem.