What's the adjective for vanity? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs vainglory and vanitize which may be used as adjectives within certain contexts.
vain
Overly proud of oneself, especially concerning appearance; having a high opinion of one's own accomplishments with slight reason.
Having no real substance, value, or importance; empty; void; worthless; unsatisfying.