Which word best describes something that is wealthy and luxurious?

The term "opulent" is most suitable for describing something that is wealthy and luxurious. It specifically conveys a sense of grandeur, affluence, and lavishness, often associated with luxurious surroundings or lifestyles. When we think of opulence, we envision rich decorations, expensive materials, and an overall atmosphere of wealth and abundance, which perfectly aligns with the idea of something being both wealthy and luxurious.

In contrast, "stolid" refers to someone who is emotionally impassive or not easily stirred, which has no relation to wealth or luxury. "Pliable" describes something that is easily bent or flexible, often in a physical sense, rather than indicating any richness or lavishness. "Tentative" signifies something that is uncertain or not fully developed, which also does not connect with the luxurious qualities implied in the question. Thus, "opulent" stands out as the word that encapsulates the desired meaning.