I've never seen this word "priggish" before, is this commonly used?

Native speaker’s answer
Rebecca
"Priggish" is a bit of a British word and is used to describe people who are self-righteous, who act as if they are holier and superior to you in morality. Ex: He acts so priggish, but he's hypocritical with the way he acts. Ex: Avoid acting in a priggish or hypocritical way.