in·de·fin·able /-ˈfaɪnəbəl/
  (a.)不能下定義的,不確定的
  In·de·fin·a·ble a. Incapable of being defined or described; inexplicable.
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  indefinable
       adj 1: not capable of being precisely or readily described; not
              easily put into words; "an indefinable feeling of
              terror"; "an abstract concept that seems indefinable"
              [syn: undefinable]
       2: defying expression or description; "indefinable yearnings";
          "indescribable beauty"; "ineffable ecstasy";
          "inexpressible anguish"; "unspeakable happiness";
          "unutterable contempt"; "a thing of untellable splendor"
          [syn: indescribable, ineffable, unspeakable, untellable,
           unutterable]