Fumacious is an uncommon word that means having a smoky or hazy appearance or smell. Some synonyms for fumacious include smoky, misty, hazy, foggy, and smoggy. Each of these words implies a degree of opacity or obscurity, whether it be from fog, smoke, or pollution in the air. Other related synonyms might include cloudy, murky, or nebulous, which all suggest a lack of clarity or definition. Alternatively, fumacious might also be described as having an evocative or pungent odor, reminiscent of smoke, fire, or burnt materials. In this case, some appropriate synonyms might include scented, fragrant, or aromatic.