improvident (adj.)

• brash
• brazen
• careless
• extravagant
• feckless
• happy-go-lucky
• headlong
• heedless
• impetuous
• imprudent
• impudent
• impulsive
• incautious
• indiscreet
• injudicious
• insolent
• lavish
• negligent
• overbold
• overconfident
• overweening
• prodigal
• profligate
• profuse
• rash
• reckless
• shiftless
• spendthrift
• temerarious
• thoughtless
• thriftless
• uneconomical
• unmindful
• unthinking
• unthoughtful
• unwary
• wasteful