extortionate

extortionate (http://definr.com/extortionate)

     adj : greatly exceeding bounds of reason or moderation;
           "exorbitant rent"; "extortionate prices"; "spends an
           outrageous amount on entertainment"; "usorious interest
           rate"; "unconscionable spending" [syn: exorbitant, outrageous,
            steep, unconscionable, usurious]