Definition: marked by or paying little heed or attention
Usage: We have always known that heedless self-interest was bad morals; we know now that it is bad economics--Franklin D. Roosevelt; heedless of danger; heedless of the child's crying
Similar words: regardless, careless
Definition: (usually followed by `of') without due thought or consideration
Usage: careless of the consequences; crushing the blooms with regardless tread
Similar words: indifferent, deaf
Definition: (usually followed by `to') unwilling or refusing to pay heed
Usage: deaf to her warnings