Synonyms for Usurious:

adj.

avaricious (adjective)
hoarding, greedy, acquisitive, grasping, possessive, miserly, mercenary, monopolistic, rapacious, venal, Cadging, money-grubbing, selfish, avaricious, sordid.
grasping (adjective)
miserly, acquisitive, avaricious, selfish, extortionate, venal, rapacious.

n.

usurious (noun)
exorbitant, immoderate, extortionate, outrageous, unconscionable, steep.

Other synonyms:

Other relevant words:
exorbitant, immoderate, extortionate, outrageous, unconscionable, steep.