The word "dis-annuls" means to revoke or cancel a legal decision or contract. Some common synonyms for this term include repeal, invalidate, nullify, negate, void, and undo. These words all convey a sense of taking back or negating something that has been previously established. Each of these synonyms carries a slightly different connotation, with some emphasizing the legal aspect of the action, while others focus more on the practical implications. Regardless of the specific word used, all these synonyms refer to the act of overturning a previous decision or action.