Hazardousness refers to the dangerous and risky qualities of something, but there are many antonyms for this word that convey safety and security. Words such as safety, security, comfort, protection, and reliability are all opposite meanings of hazardousness. Safe refers to something that is not dangerous or risky, while secure refers to something that is protected from harm or danger. Comfort implies a feeling of physical ease and a lack of danger. Protection is the act of keeping something safe from harm or damage. Finally, reliability indicates that something is trustworthy and dependable, with little risk involved. These antonyms provide a range of possible meanings that are quite different from hazardousness.