What is the opposite of 'heedless' in terms of behavior?

The term 'heedless' refers to a lack of attention or care, where an individual acts without considering the consequences of their actions. Therefore, the opposite behavior would be characterized by thoughtfulness and caution.

Choosing 'cautious' as the answer highlights an important distinction in behavior. A cautious person is mindful of their actions and their effects, taking appropriate steps to avoid potential harm or negative outcomes. This careful consideration stands in stark contrast to heedlessness, underscoring an awareness and attentiveness that is essential in responsible decision-making.

The other options do not capture this sense of awareness or intentionality; instead, they connote a lack of discretion or care, which is not the opposite of being heedless.