What is what does pretentious mean?

Pretentious means behaving or speaking in a way that suggests one is more important, intelligent, or cultured than they really are, often in an effort to impress others. It can refer to someone who tries too hard to be sophisticated or impressive, or who displays exaggerated knowledge or tastes in art, literature, music, or other areas. It can also describe things such as language, clothing, or decor that are intended to appear more important or elegant than they actually are.