Synonyms and related words :
brash, brazen, brazenfaced, careless, extravagant, feckless, grasshopper, happy-go-lucky, headlong, heedless, hubristic, impetuous, imprudent, impudent, impulsive, incautious, indiscreet, injudicious, insolent, lavish, negligent, overbold, overcareless, overconfident, oversure, overweening, prodigal, profligate, profuse, rash, reckless, shiftless, short-sighted, spendthrift, temerarious, thoughtless, thriftless, unchary, uneconomical, unmindful, unproviding, unthinking, unthoughtful, unthrifty, unwary, wasteful