GRE TOEFL hazardous Definition Involving risk or danger. Example "Working with chemicals can be hazardous without proper protective gear." Sign in to save GRE Quiz → TOEFL Quiz → ← hazard haze → Study tips featuring "hazardous" Write GRE Words Into Your Own Sentences TOEFL Academic Vocabulary: Study by Topic Related words GRE swill GRE taper GRE testy GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct