Webster's Revised Unabridged Dictionary · 1913

Vain

Vain (vān) , adjective

[French vain, Latin vanus empty, void, vain. Compare Vanish, Vanity, Vaunt to boast.]

1.
Having no real substance, value, or importance; empty; void; worthless; unsatisfying.
Thy vain excuse. — Shakespeare
Every man walketh in a vain show. — Bible (KJV) - Psalm xxxix. 6
Let no man deceive you with vain words. — Eph. v. 6
Vain pomp, and glory of this world, I hate ye! — Shakespeare
Vain wisdom all, and false philosophy. — Milton
2.
Destitute of force or efficacy; effecting no purpose; fruitless; ineffectual; as, vain toil; a vain attempt.
Bring no more vain oblations. — Isa. i. 13
Vain is the force of man To crush the pillars which the pile sustain. — Dryden
3.
Proud of petty things, or of trifling attainments; having a high opinion of one's own accomplishments with slight reason; conceited; puffed up; inflated.
But wilt thou know, O vain man, that faith apart from works is barren? — James ii. 20 (Rev. Ver.)
The minstrels played on every side, Vain of their art. — Dryden
4.
Showy; ostentatious.
Load some vain church with old theatric state. — Pope

Vain , noun

Vanity; emptiness; -- now used only in the phrase in vain.
Collocations (3)
For vain , See In vain. [Obsolete] — Shakespeare
In vain , to no purpose; without effect; ineffectually. In vain doth valor bleed. — Milton In vain they do worship me. — Matt. xv. 9
To take the name of God in vain , to use the name of God with levity or profaneness.