The antonyms for the term "becomes valid" are invalidates, nullifies, disproves, discredits, and contradicts. These words are used to describe situations in which an idea, argument, or statement is found to be untrue, unacceptable, or flawed. For example, a court ruling may invalidate a contract, or scientific evidence may disprove a theory. In contrast, when something becomes valid, it is confirmed as true, legal, or effective. It is important to understand both the antonyms and synonyms of a word to use it effectively and communicate with clarity. Knowing the opposing meanings of words helps in effective communication and debate.