unstoppable

Unstoppable is an adjective meaning unable to be stopped or prevented from continuing, either literally or figuratively. It can describe physical momentum, a rapidly growing trend, or a person whose determination seems irresistible. The term derives from un- plus stoppable; stoppable is a standard but less common form, with the meaning clear in context.

In physics and philosophy, the phrase is often used in the thought experiment of the unstoppable force and the immovable object, a paradox illustrating incompatibility between absolute extremes. In everyday language it serves as a hyperbolic descriptor for perseverance or inevitability.

In culture, unstoppable has been used as a title or theme in media. The 2010 American action thriller Unstoppable, directed by Tony Scott and starring Denzel Washington and Chris Pine, centers on a runaway freight train. The term also appears in music and literature as an album or song title, reflecting themes of perseverance, momentum, and resolve.

In common usage, unstoppable is often employed in motivational contexts or marketing copy to convey confidence in ongoing success or momentum, while remaining a rhetorical exaggeration when describing complex, contingent processes or human challenges.