normal (the usual or expected state, level, or amount): You can call me during normal working hours.
usual (commonly occurring or done; habitual): The usual time for lunch is 1 PM.
ordinary (not special or unusual): It was just an ordinary day.
standard (normal; not special): We have shoes in all the standard sizes.
regular (usual, normal): This is my regular route to work.
average (ordinary, usual): Anyone of average intelligence knows the answer.
typical (usual, normal): It’s typical to feel nervous before an exam.
run-of-the-mill (not special or unusual): It’s just a run-of-the-mill war movie.