Which adjective signifies something that is causing harm or injury?

The adjective that signifies something causing harm or injury is "noisome." This term is often used to describe something that is offensive or harmful, particularly in the context of foul odors or something that is detrimental to health. When something is described as noisome, it suggests a negative impact, aligning well with the idea of causing injury or harm.

In contrast, "beneficial" means something that produces good effects or advantages, "innocuous" refers to something that is harmless, and "wholesome" describes something that promotes health or moral well-being. Each of these alternatives conveys a sense of positivity or safety, which stands in stark contrast to the harmful implications of "noisome."