Of the nature of a habit
ingrained, confirmed, frequent, periodic, continual, routine, mechanical, automatic, perfunctory, seasoned, iterated, permanent, perpetual, on-going, consuetudinary, consuetudinal, fixed, rooted, inveterate, systematic, recurrent, periodical, methodical, repeated, iterative, reiterative, disciplined, practiced, accustomed, established, set, repetitious, cyclic, reiterated, settled, trite, stereotyped, formal, addicted, acting by force of habit, being such by habit, in a groove, in a rut; see also chronic, constant 1, regular 3.
Antonyms different*, exceptional, departing.