un·mis·tak·able /ˌʌnməˈstekəbəl/
  (a.)不會錯的
  Un·mis·tak·a·ble a. Incapable of being mistaken or misunderstood; clear; plain; obvious; evident. -- Un*mis*tak*a*bly, adv.
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  unmistakable
       adj : clearly evident to the mind; "his opposition to slavery was
             unmistakable"