natural

because it is difficult to know (scientifically, psychologically, philosophically) whether something is indeed "natural" and, secondarily, whether being natural is good, it is better not to use these terms with respect to sex roles, age, race, sexual orientation, disabilities, or other human variables. These terms are often a substitute for informed thought, an opinion on what seems "right." "For centuries people have appealed to the 'natural' to back up their moral and social recommendations.... it is often taken for granted that if one persuades us that 'X is natural,' he has also persuaded us that 'X is good'" (Christine Pierce, in Vivian Gornick and Barbara K. Moran, eds., Woman in Sexist Society). Consider using automatic, instinctive, essential, idiosyncratic, usual, often-seen, common, habitual, accustomed, customary, established, time-honored, regulation, traditional, general, prevailing, frequent, popular, predictable, expected.