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vain (EN)
прилагательное

прилагательное “vain”

основа vain (more/most)
  1. тщетный
    They tried in vain to push the broken car up the steep hill.
  2. тщеславный
    She was so vain that she spent hours looking at herself in the mirror every day.
  3. пустой (в контексте "без истинной ценности или значимости")
    His promise turned out to be vain when he failed to follow through with any action.