坚定不移 is formed by combining the adjective 坚定, meaning "firm" or "steadfast", with the phrase 不移, where 不 functions as a negator and 移 means "to move", so 不移 signifies "unmoving". The compound 坚定不移 thus intensifies the sense of resoluteness by appending the notion of immovability directly to the concept of firmness, creating a unified meaning of unwavering determination.