Miasma/miˈæzmə/ Definition 1 of 4Pro Tip 1/3Negative Connotation Miasma often suggests harmful or oppressive qualities of the unpleasant smell. The entire alley was engulfed in a miasma that turned stomachs. Pro Tip 2/3Intensity of Smell It usually refers to strong, pervasive smells, not mild or fleeting ones. As we entered the abandoned house, a miasma of mold hit us. Pro Tip 3/3Evokes Visual Imagery Although about smell, it can suggest a visible, fog-like presence. A miasma hung over the landfill, visible from a distance.