What is the term for behavior that shows a lack of care or attention?

The term that signifies behavior exhibiting a lack of care or attention is "careless." This adjective describes actions that do not display the necessary caution, thoughtfulness, or diligence expected in various situations. In contexts where precision and responsibility are valued, being termed as careless indicates a failure to meet those standards, often leading to mistakes or oversights.

The other terms do not fit this definition. "Meticulous" refers to being very careful and precise, which is the opposite of showing a lack of care. "Considerate" implies being thoughtful of others' feelings or needs, suggesting a level of attentiveness and care. "Attentive" describes someone who is focused and paying attention, again contrasting with the concept of being careless. Therefore, the correct term that encapsulates the idea of neglecting attention or care is "careless."