extortionate
adjective
disapproving uk/ɪkˈstɔːʃənət/ usmore expensive than is reasonable:
extortionate fee/price/rate, etc. Most retailers charge extortionate prices for extended warranties - often more than three times as much as an independent provider.
extortionately
adverb uk/ɪkˈstɔːʃənətli/ us/-ˈstɔːr-/
The government has agreed on measures that protect the renewable energy industry from extortionately high national grid access charges.