When expressing disagreement with someone or something, it can be useful to have a variety of synonyms for the phrase "speak against." These phrases might include "object to," "protest," "condemn," "challenge," "oppose," or "disapprove of." Depending on the context, other options might include "criticize," "rebuke," "denounce," "reject," or "argue against." No matter what term is used, it's important to speak out respectfully and thoughtfully, focusing on the issue at hand rather than attacking the individual or group being opposed. Careful use of language can help build understanding and foster positive discussion, even in situations of disagreement.