adj.: customary, accustomed, average, conventional, habitual, ritual, stock, usual, routine, regular, such as happens or is done or used, etc in many or most instances
Thesaurus
trivial, plain, of the ordinary or usual standard, common, quotidian, old, everyday, used or happening daily, conventional, green, orthodox, plain, so frequently seen, heard, etc that it is familiar and expected, expected, known for a long time, naive, commonplace, not decorated or luxurious, primitive, average, plain in form, design, etc, unexceptional, no special constant consuetudinary, routine