spotless
adj
1 very clean and tidy 极清洁的
He keeps his house spotless. 他把家里收拾得很整洁.
2 (fig fml 比喻, 文) free from flaws; morally pure 无瑕疵的; 道德上纯洁的
a spotless reputation 清白的名声.
Yes, and we must stop people walking on this floor until it's firm. It may be necessary to put up a notice saying Keep off. Another thing, we' ll have to drill a hole in the wall for the electric wires.