exorbitant

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

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