regular

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