immutable traffic sign on blue sky

immutable traffic sign blue sky unchangeable inalterable unvarying unmodifiable fixed constant permanent unwavering unyielding rigorous steadfast consistent invariable unchanging unaltering unshakable resolute set enduring stable perpetual firm staunch unswerving unfluctuating steady unchangeless settled sturdy inflexible solid perennial established unfaltering unassailable timeless unalterable indestructible resilient unbreakable inviolable unshakeable unbending unshifting irrefutable irrevocable