unstoppable
adj.adj. impossible to stop or prevent from moving forward. You use it to describe someone or something that has so much power or energy that nothing can get in the way.
adj. incapable of being halted, obstructed, or defeated. Often used to describe physical momentum, social trends, or a person's rise to success.
The team's momentum made them feel unstoppable.
Once the heavy rain started, the mudslide became an unstoppable force that destroyed everything in its path.
The candidate's rise in the polls seemed unstoppable, as even the most seasoned political analysts struggled to find a strategy that could effectively counter her popular appeal.
From un- + stoppable.
Typically used as a predicative adjective after linking verbs like 'seem' or 'become', or attributively before a noun.