If "deemed" means "considered" or "judged," then its antonyms could be:
* Disregarded
* Ignored
* Overlooked
* Dismissed
* Rejected
If "deemed" means "considered necessary or appropriate," then its antonyms could be:
* Unnecessary
* Inappropriate
* Unacceptable
* Unwanted
* Obsolete
If "deemed" means "considered to be something," then its antonyms could be:
* Disproved
* Refuted
* Contradicted
* Debunked
* Discredited
It's important to consider the specific context of the sentence to determine the most accurate antonym.