Adjective: miasmatic
- Giving off a strong unpleasant smell
"The miasmatic swamp made the explorers gag";
- reeking, ripe [informal]
See also: ill-smelling, malodorous, malodourous [Brit, Cdn, non-standard], minging [Brit, informal], niffy [Brit, informal], pongy [Brit, informal], stinky [informal], unpleasant-smelling, whiffy [Brit, informal]
Encyclopedia: Miasmatic