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Adjective: doubtable  daw-tu-bul
  1. Open to doubt or suspicion
    - doubtful, dubious, dubitable, in question, questionable
     
  2. [archaic] Inspiring fear
    "the doubtable prospect of major surgery";
    - formidable, redoubtable, unnerving

See also: alarming, deniable, questionable

Encyclopedia: Doubtable