Prodigal

Part of speech: noun (n.)

One who expends money extravagantly, viciously, or without necessity; one that is profuse or lavish in any expenditure; a waster; a spendthrift. "Noble prodigals of life." Trench.

Part of speech: adjective (a.)

Given to extravagant expenditure; expending money or other things without necessity; recklessly or viciously profuse; lavish; wasteful; not frugal or economical; as, a prodigal man; the prodigal son; prodigal giving; prodigal expenses. In fighting fields [patriots] were prodigal of blood. Dryden.

Synonyms: Profuse; lavish; extravagant; squandering; wasteful. See Profuse.