What is the best definition for the word fastidious?

The term "fastidious" refers to someone who is very attentive to detail and is often difficult to please because of their high standards. It embodies a sense of meticulousness and a demand for precision in various aspects, whether in tasks or expectations. Therefore, defining "fastidious" as demanding captures this idea effectively, as it highlights the tendency of such individuals to expect carefulness and meticulousness from themselves and others.

In contrast, other options would suggest an opposite quality or a lack of concern, which does not align with the true meaning of "fastidious." For example, being careless implies a lack of attention to detail, which is contrary to the essence of being fastidious. Similarly, being easygoing suggests a laid-back attitude that does not resonate with the meticulous and exacting nature associated with fastidiousness. Lastly, indifference conveys a lack of concern or interest, further distancing it from the high standards and rigorous attention inherent in the term fastidious.