The Oxford Thesaurus An A-Z Dictionary of Synonyms - improvidentadj.

1) short-sighted, imprudent, wasteful, profligate, prodigal, spendthrift, extravagant, lavish, profuse, happy-go-lucky, penny wise and pound foolish, uneconomic(al) , thriftless: He who is improvident in his youth plans for a short life. 2) incautious, unwary, rash, reckless, impulsive, impetuous, headlong, heedless, careless, unthinking, unthoughtful, unmindful: The club's present financial straits are the result of having an improvident treasurer.