Answer: ingrained

AnswerCrossword Clue
INGRAINEDDeep-rooted
INGRAINEDFixed deeply and firmly
INGRAINEDDeep-seated.
INGRAINEDDeep-seated
ingrained(of a habit, belief, or attitude) Firmly fixed or established; difficult to change
ingrainedINGRAIN, to impress firmly on the mind
ingrained(of dirt or a stain) Deeply embedded and thus difficult to remove