Incautious

careless thoughtless reckless heedless negligent rash imprudent inconsiderate hasty unthinking unguarded unmindful injudicious unwatchful unvigilant impetuous unalert indiscreet neglectful improvident precipitate off guard hotheaded wary bold devil-may-care ill-advised ill-judged madcap regardless wide open any old way caught napping fast-and-loose foot-in-mouth pay no mind playing with fire sticking one’s neck out