Forgot to add: hazards can also include flammability, explosiveness, damage to the aquatic environment, irritating, corrosive, oxidising ...

No, 'hazardous' is ambiguous. How hazardous? To whom? Via what routes? The correct terms are harmful (damaging to health at levels that might be encountered, e.g not eating 100 kg of it), toxic (harmful at very low levels), carcinogenic and teratogenic. The correct terms are here: http://www.hse.gov.uk/chip/phrases.htm This is why risk assessments in chemistry are carefully worded in some detail. You can't describe how harmful a chemical is in a single word.

... for a chemical-free substance. See: http://www.rsc.org/AboutUs/News/PressReleases/2008/ChemicalFree.asp