hazardous

From Middle French hasardeux, equivalent to hazard +‎ -ous.

• (General American) IPA^(key): /ˈhæ.zɚ.dɪs/, /-dəs/

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hazardous (comparative more hazardous, superlative most hazardous)

1. Risky; dangerous; with the nature of a hazard.
   • 2014 June 14, “It's a gas”, in The Economist, volume 411, number 8891:

     But out of sight is out of mind. And that […] means that many old sewers have been neglected and are in dire need of repair. If that repair does not come in time, the result is noxious and potentially hazardous.

2. Of or involving chance.

• non-hazardous, nonhazardous

• hazardously
• hazardous material, hazmat
• potentially hazardous object
• ultrahazardous

One of four common words ending in -dous, which are hazardous, horrendous, stupendous, and tremendous.^[1]