Indesinent is an uncommon word, meaning something that is incapable of being stopped or delayed. While there are no exact synonyms for indesinent, there are several words that convey a similar meaning. Words like relentless, persistent, unstoppable, and unyielding are all used to describe something that continues without interruption or hindrance. Stubborn, determined, and tenacious are also words that can be used to describe behaviors that are difficult to stop or control. In the medical context, the term malignant can also be used to describe something that grows and spreads without control. Ultimately, the best synonym for indesinent will depend on the context in which the word is used.