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Vain (superl.) Having no real substance, value, or importance; empty; void; worthless; unsatisfying.
Vain (superl.) Destitute of forge or efficacy; effecting no purpose; fruitless; ineffectual; as, vain toil; a vain attempt.
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.
Vain (superl.) Showy; ostentatious.
Vain (n.) Vanity; emptiness; -- now used only in the phrase in vain.