What is the opposite of rewarded?

The opposite of rewarded could be "unrewarded" (uncompensated) for the lack of a reward, or "penalized" (punished) as the opposite of being rewarded.

A reference book that lists synonyms (similar words) and antonyms (opposite words) is called a thesaurus. However, because some English words can mean several specific and different things, they can have many possible synonyms, and more than one antonym.