Clean

The opposite of clean is dirty. You cannot have half clean or 50% dirty as it will become untenable and uneasy to many. Certainly no 2 ways about it. When we talk about how clean a place is, we cannot say it is acceptable based on lower standard set instead of trying to make comparison with places having higher standard. That's why I cannot understand when some people said our city environment is better off than those in rural based city rather than compared it to those in Singapore or Japan for example. It is matter of upholding our higher standard and take it as the base line for moving towards higher and better position. It is useless of benchmarking ourselves with cities not better than us and claimed that we are, at least much better than others.