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vain (EN)
adjetivo

adjetivo “vain”

forma base vain (more/most)
  1. infructuoso
    They tried in vain to push the broken car up the steep hill.
  2. vanidoso
    She was so vain that she spent hours looking at herself in the mirror every day.
  3. vacío (en el sentido de carecer de significado o importancia)
    His promise turned out to be vain when he failed to follow through with any action.