regular

accepted accurate accustomed amicable average blank businesslike certain changeless characteristic common commonest conformable constant continual continuous conventional correct customary cyclical daily dull dull duller duller equable even faithfully formal frequenter general good gradational gradual habitual habitué horizontal innate instinctive instinctual intimate invariable invariant isochronal isochronous judicial just legitimate level mainstream measured methodic methodical methodical/methodic monochromatic more accurate more certain more constant more correct more even more formal more methodic more methodic more methodical more methodical more natural more normal more orderly more prevalent more readable more solid more uniform most certain most correct most methodic most methodic most methodical most methodical most punctual natural neat neater neatest normal old school old-school orderly pandemic paradigmatic periodic planar plane prevailing prevalent prototypal prototypic prototypical punctual readable recurrent round-the-clock routine run-of-the-mill sequential set shapely sincere sincerest smooth smoother smoothest sociable solid standing stated steady steady steady-going step-by-step stock stocker stuporous symmetric symmetrical systematic systematical through time-honored traditional trig true truer truest typic typical unbroken uniform universal unremitting unwavering usual veridical virtuous wonted