Which term is used to describe causing harm or damage?

The term that describes causing harm or damage is "detrimental." This word is often used in contexts where an action or a factor negatively impacts a situation, condition, or entity. For example, certain behaviors, habits, or environmental factors can be deemed detrimental to one's health, indicating that they have harmful or adverse effects.

The other terms do not convey the same meaning. "Opaque" refers to something that is not transparent or difficult to understand, "soporific" relates to causing sleep or drowsiness, and "symmetry" pertains to balanced proportions or regularity in shape and form. None of these capture the essence of causing harm or damage like the term "detrimental" does.