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1. Of or related to or containing sulfur or derived from sulfur
   - sulphurous [Brit, Cdn], sulphureous [Brit]
    
2. Harsh or corrosive in tone
   "a sulfurous denunciation";
   - acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulphurous [Brit, Cdn], virulent, vitriolic, acidulous, sulphureous [Brit]
    
3. Characterized by oppressive heat and humidity
   "the sulfurous atmosphere preceding a thunderstorm";
   - sultry, stifling, sulphurous [Brit, Cdn], sulphureous [Brit]

See also: hot, unpleasant

Encyclopedia: Sulfurous