Merriam-Webster Collegiate Dictionary - profligate

 I. adjective  Etymology: Latin profligatus, from past participle of profligare to strike down, from pro- forward, down + -fligare (akin to fligere to strike); akin to Greek phlibein to squeeze  Date: 1647  1. completely given up to dissipation and licentiousness  2. wildly extravagant ; prodigal  • ~ly adverb  II. noun  Date: 1709 a person given to wildly extravagant and usually grossly self-indulgent expenditure