Definitions
1.adjectiveOverly proud of oneself, especially concerning appearance; having a high opinion of one's own accomplishments with slight reason.
2.adjectiveHaving no real substance, value, or importance; empty; void; worthless; unsatisfying.
3.adjectiveEffecting no purpose; pointless, futile."vain toil; a vain attempt"
4.adjectiveShowy; ostentatious.