The verb 'disannul' means to declare something invalid or to cancel an existing law, agreement or contract. There are several synonyms for disannul, including 'revoke', 'nullify', 'invalidate', 'annul', 'void', 'cancel', 'abolish' and 'rescind'. All of these words imply the act of abolishing something previously agreed upon, thereby making it legally and morally void. The term "disannuls" is often used in legal contexts to describe the act of striking down a law or agreement that is no longer valid. In a broader sense, synonyms for disannul can also mean to undo, reverse, or negate something that was previously done or agreed upon.