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Meaning of unimpeachable

un•im•peach•a•ble

Pronunciation: (un"im-pē'chu-bul), [key]
— adj.
  1. above suspicion; impossible to discredit; impeccable: unimpeachable motives.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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