The word "hazardousnesses" refers to the state or quality of being dangerous or risky. Its antonyms on the other hand, describe safety, security, and peacefulness. Some suitable antonyms for "hazardousnesses" include safety, security, wellbeing, ease, reliability, and certainty. Using these words in the right context can help convey a message of safety and stability. The use of such words is crucial in safety-critical industries such as aviation, healthcare, and manufacturing. It is important to use the appropriate antonym of hazardousness to ensure that communication remains clear and concise so as to prevent any miscommunication that could lead to a misunderstanding which can be hazardous.