Which term describes someone very careful and attentive to details?

The term "meticulous" is used to describe someone who is extremely careful and pays great attention to detail. This quality is often associated with being thorough, precise, and diligent in one’s work or actions. A meticulous person ensures that even the smallest aspects are considered and executed with accuracy, which is essential in fields that require high standards, such as research, engineering, or any demanding creative work. This characteristic contributes to the overall quality and reliability of their outcomes, making it a highly valued trait in both professional and personal contexts.

The other terms present a contrasting meaning: "negligent" implies a lack of attention and care; "lax" suggests a relaxed or careless attitude towards responsibility; and "careless" indicates a disregard for detail. These terms highlight the shortcomings of being inattentive or undisciplined, thereby reinforcing the significance of being meticulous.