Fumid, meaning filled with smoke or vapor, can be substituted with a variety of synonyms. Some options include smoky, misty, foggy, hazy, humid, steamy, and murky. These synonyms emphasize different aspects of fumid. "Smoky" connotes the presence of smoke or fire, while "misty" implies a thinner, less dense substance. "Foggy," "hazy," and "murky" all suggest a lack of clarity or visibility. "Humid" and "steamy" emphasize the presence of moisture or heat. Depending on the context, any of these synonyms could be used to describe a location or situation that is fumid.