What is the meaning of the word "scrupulous"?

The word "scrupulous" is defined as being extremely attentive to detail and having a strong sense of ethics or principles. When someone is described as scrupulous, it implies that they are careful in their actions, ensuring that they adhere to moral standards and are conscientious in their duties. This word often reflects a commitment to doing what is right and just, often going above and beyond to ensure the integrity of their work or choices. Hence, the answer that conveys this carefulness and principled nature is correct.

The other options describe different characteristics that do not align with the meaning of "scrupulous." Stealthy and hidden relates to secrecy, while mysterious and strange involves qualities of enigma and oddity. Lastly, spiteful and ill-willed suggests a negative intent or malice, which is contrary to the conscientious intention represented by "scrupulous."