spending much more than is necessary or wise; wasteful

an extravagant shopper.

excessively high

extravagant expenses; extravagant prices.

exceeding the bounds of reason, as actions, demands, opinions, or passions.

going beyond what is deserved or justifiable

extravagant praise.

Obsolete . wandering beyond bounds.

noun

embarrassment , excessiveness , exorbitance , extravagance , extravagancy , overabundance , plethora , superabundance , superfluity , superfluousness , surfeit