ephemeral russian

• мину́тный

  momentary, short-lived, transient, ephemeral

• эфеме́рный

  ephemeral

• однодне́вка

  ephemeron, something ephemeral

• тлен

  decay, dust, ashes, corruption, decomposition

  transience, ephemerality, vanity, futility

• скороте́чность

  transience, fleetingness, ephemerality, short-livedness

• быстроте́чность

  transience, fleetingness, ephemerality

• быстротечно

  fleetingly, transiently, ephemerally