What does "innocuous" mean?

The term "innocuous" refers to something that is harmless or inoffensive. It derives from the Latin word "innocuus," meaning "not harmful." In various contexts, it can describe substances, actions, or comments that do not pose any danger or cause any offense to others. In contrast, the other options present meanings that do not align with the definition of "innocuous." For instance, extremely loud would pertain to volume or noise levels, while superior skill or ability relates to proficiency or expertise, and to have an effect against suggests a negative impact or opposing force. Thus, the choice that accurately reflects the meaning of "innocuous" is indeed its association with being harmless or safe.