Which word best describes a person who is "fastidious"?

The term "fastidious" characterizes someone who pays great attention to detail and is very particular about their standards, often to the point of being overly critical or demanding. A fastidious person is meticulous in their approach, ensuring that everything is done precisely and to a high standard.

The choice that aligns with this definition is "meticulous," as it implies a careful and precise attention to detail that matches the essence of being fastidious. Both terms reflect a quality of thoroughness and exactness in one's work or preferences.

In contrast, the other options imply a lack of concern or a more relaxed approach, which does not resonate with the careful nature of fastidiousness. Words like "careless," "indifferent," and "laid-back" suggest a disregard for detail and standards, opposing the meticulousness associated with being fastidious. Thus, "meticulous" is the most appropriate choice to describe someone who is fastidious.