There are multiple synonyms for the phrase "make unnecessary." Some of these words include eliminate, remove, discard, abolish, prohibit, and nullify. When something is made unnecessary, it is essentially eliminated or removed from the equation or situation. Discarding something implies that it is no longer needed and can be disposed of. To abolish something means to put an end to it completely. Prohibiting something means that it is not allowed or disallowed. While nullifying something means rendering it invalid or useless. All of these synonyms convey a similar meaning to "make unnecessary," each with their unique connotations.