HAZARDOUS Synonyms: 66 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/hazardous
WebSynonyms for HAZARDOUS: dangerous, perilous, risky, serious, unsafe, precarious, treacherous, menacing; Antonyms of HAZARDOUS: safe, harmless, nonhazardous, innocuous, innocent, beneficial, nonthreatening, good.
DA: 82 PA: 24 MOZ Rank: 97