When an object, statement, or action is rendered invalid, it becomes useless, ineffective, or meaningless. Antonyms for rendered invalid would include validated, verified, approved, confirmed, and accepted. These words suggest that something is authentic, legitimate, and verified to be true. Other antonyms could include effective, useful, powerful, and functional, which imply that something is still capable of achieving its intended outcome or function. Essentially, antonyms for rendered invalid describe something that is still valid, valuable, or impactful in some way. Overall, these antonyms provide a stark contrast to the negative connotation of rendered invalid and can help to convey a more positive or hopeful message.