What is the opposite of sanctimonious?

The opposite of sanctimonious is humble, genuine, or modest. These traits are characterized by sincerity, openness, and a lack of pretentiousness. Those who are humble or modest do not seek to appear morally superior or virtuous, but instead, exhibit a sense of authenticity and a lack of self-righteousness. They are able to acknowledge their flaws and shortcomings without feeling the need to project a facade of perfection or righteousness.