WordWeb Online

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

See also: hot, unpleasant

Encyclopedia: Sulphurous