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Adjective: unconscionable  ,ún'kón-shu-nu-bul
  1. Lacking a conscience
    "an unconscionable liar";
    - conscienceless
     
  2. (of a cost) unreasonably high or excessive
    "unconscionable spending"; "The restaurant charged unconscionable prices for basic dishes";";
    - exorbitant, extortionate, outrageous, steep, usurious [formal], exhorbitant [non-standard], eye-watering [informal]

See also: immoderate, unconscientious

Encyclopedia: Unconscionable