GRE TOEFL hazardous Definition Involving risk or danger. Example "Working with chemicals can be hazardous without proper protective gear." Sign in to save GRE PDF — $25 TOEFL PDF — $25 ← hazard haze → Study tips featuring "hazardous" TOEFL Academic Vocabulary: Study by Topic Related words GRE awe GRE smithereens GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct GRE aberrant