The word "in-noxiousnesses" refers to the state of being harmless or not causing harm. Antonyms for this word include terms such as dangerous, harmful, lethal, poisonous, and toxic. These words describe situations or substances that can be harmful to living creatures or the environment, in contrast to the benign nature of "in-noxiousnesses." Another set of antonyms for this term are damaging, destructive, and harmful. These words describe outcomes or consequences that result in harm or injury, such as damage to property, physical injury, or emotional harm. In short, antonyms for in-noxiousnesses describe anything that poses a threat to safety or health.