Vain

прилагательное 1) тщеславный; самодовольный, самовлюблённый, полный самомнения Например: vain about one's appearance — высокого мнения о своей внешности Синоним(ы): conceited 2) напрасный, бесполезный, тщетный Например: It is vain to protest. — Протестовать бесполезно. Синоним(ы): futile, unavailing 3) поверхностный, пустой; показной Синоним(ы): empty, tawdry, ostentatious

Большой англо-русский словарь

Vain

adjective Etymology: Middle English, from Anglo-French, empty, futile, from Latin vanus — more at wane 1. having no real value; idle, worthless Example: vain pretensions 2. marked by futility or ineffectualness; unsuccessful, useless Example: vain efforts to escape 3. archaic foolish, silly 4. having or showing undue or excessive pride in one's appearance or achievements; conceited Synonyms: see futilevainly adverbvainness noun Synonyms: vain, nugatory, otiose, idle, empty, hollow mean being without worth or significance. vain implies either absolute or relative absence of value Example: vain promises. nugatory suggests triviality or insignificance Example: a monarch with nugatory powers. otiose suggests that something serves no purpose and is either an encumbrance or a superfluity Example: a film without a single otiose scene. idle suggests being incapable of worthwhile use or effect Example: idle speculations. empty and hollow suggest a deceiving lack of real substance or soundness or genuineness Example: an empty attempt at reconciliation Example: a hollow victory.

Merriam-Webster's Collegiate Dictionary