When you insist on something, it means that you are demanding that it must be done. There are several synonyms for insisting that can be used interchangeably to convey the same level of urgency and determination. Some of these synonyms include: persevering, persisting, pressing, urging, advocating, asserting, maintaining, and affirming. Each of these words helps to convey a sense of commitment and determination to a particular course of action. By using different synonyms for insisting, you can inject variety and interest into your writing and conversation. Ultimately, the choice of synonym comes down to personal preference and context.