superl showy; ostentatious.
2. vain ·noun vanity; emptiness;
now used only in the phrase in vain.
3. vain ·superl having no real substance, value, or importance; empty; void; worthless; unsatisfying.
4. vain ·superl destitute of forge or efficacy; effecting no purpose; fruitless; ineffectual; as, vain toil; a vain attempt.
5. vain ·superl proud of petty things, or of trifling attainments; having a high opinion of one's own accomplishments with slight reason; conceited; puffed up; inflated.