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Adjective: indefinable  ,in-du'fI-nu-bul
  1. Not capable of being precisely or readily described; not easily put into words
    "an abstract concept that seems indefinable"; "an indefinable feeling of terror";
    - undefinable
  2. Defying expression or description
    "indefinable yearnings";
    - indescribable, ineffable, unspeakable, untellable, unutterable, undescribable

See also: inexpressible, undefined, unexpressible, vague

Encyclopedia: Indefinable