profligate (adj.)

late 14c., "to cast down" (a sense now obsolete), from Old French aflicter, from Latin afflictare "to damage, harass, torment," frequentative of affligere (past participle afflictus) "to dash down, overthrow," from ad "to" (see ad-) + fligere (past participle flictus) "to strike."

This is reconstructed to be from PIE root *bhlig- "to strike" (source also of Greek phlibein "to press, crush," Czech blizna "scar," Welsh blif "catapult"). The weakened or transferred meaning "to trouble in body or mind, harass, distress," is attested from 1530s. Related: Afflicted; afflicting.

"shameless dissipation; the character or condition of being profligate," 1670s, from profligate + abstract noun suffix -cy.

word-forming element meaning "forward, forth, toward the front" (as in proclaim, proceed); "beforehand, in advance" (prohibit, provide); "taking care of" (procure); "in place of, on behalf of" (proconsul, pronoun); from Latin pro (adv., prep.) "on behalf of, in place of, before, for, in exchange for, just as," which also was used as a first element in compounds and had a collateral form por-.

Also in some cases from cognate Greek pro "before, in front of, sooner," which also was used in Greek as a prefix (as in problem). Both the Latin and Greek words are from PIE *pro- (source also of Sanskrit pra- "before, forward, forth;" Gothic faura "before," Old English fore "before, for, on account of," fram "forward, from;" Old Irish roar "enough"), extended form of root *per- (1) "forward," hence "in front of, before, toward, near," etc.

The common modern sense of "in favor of, favoring" (pro-independence, pro-fluoridation, pro-Soviet, etc.) was not in classical Latin and is attested in English from early 19c.