Learner's definition of VANITY
the quality of people who have too much pride in their own appearance, abilities, achievements, etc.
the quality of being vain
something (such as a belief or a way of behaving) which shows that you have too much pride in yourself, your social status, etc.
— usually plural
a bathroom cabinet that is covered by a sink and a countertop
formal + literary
the quality of being worthless or unimportant when compared to very serious things