Which word indicates a disrespectful attitude towards sacred things?

The word that best indicates a disrespectful attitude towards sacred things is "profane." This term is commonly used to describe behavior, language, or acts that show contempt or irreverence towards religious or sacred matters. It suggests a violation of something that is held in high regard, often associated with a lack of respect for the sanctity or dignity of those things.

In contrast, the other options relate to different concepts. "Rancor" denotes bitterness or hate, particularly in a long-lasting manner, and does not specifically reference attitudes towards sacred matters. "Rarefy" means to make something less dense or to refine, often used in a context far removed from respect or disrespect towards sacred things. "Raucous" describes something that is loud and disorderly, typically referring to noise or commotion, rather than an attitude of disrespect. Thus, "profane" is the term that directly pertains to a negative attitude regarding what is considered sacred.