The song "Unstoppable (Clarence Clarity Remix)" by Sia is about the idea of projecting a strong and invincible image to the world despite feeling vulnerable and unsure inside. The opening verse describes the facade that the singer puts on, smiling and doing whatever it takes to "fool this town" and keep up appearances, even while shedding tears behind her sunglasses. The pre-chorus emphasizes the armor that she puts on, showcasing her strength and resilience in the face of adversity.

The chorus is the most powerful part of the song, emphasizing the unstoppable nature of the singer with metaphors like "I'm a Porsche with no brakes" and "I don't need batteries to play". These lines convey a sense of power and invincibility, as if nothing can stop the singer from achieving her goals. This confidence is both a result of her inner strength and the image she projects to the world.

Verse two is more introspective, revealing a more vulnerable side to the singer. She acknowledges that she only feels comfortable showing her true emotions when she is alone and that the fear of rejection prevents her from revealing her true self to others. The final chorus reiterates the idea of unstoppable power, but the repetition of the phrase "unstoppable today" suggests that this power may be temporary and may require constant reinforcement. The overall message of the song is that even when feeling vulnerable, it is possible to project strength and resilience as long as one keeps their armor on and believes in their own power.