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Meaning of unstainable

un•stain•a•ble

Pronunciation: (un-stā'nu-bul), [key]
— adj.
  1. that cannot be spotted or stained, as garments.
  2. that cannot be morally reprehensible: an unstainable person.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.