"Nebulose" is a term that refers to something that is cloudy, hazy or indistinct. There are several synonyms for this word, including "opalescent," "misty," "foggy," "vague," and "hazy." "Opalescent" refers to something that has a milky, pearlescent quality to it, while "misty" and "foggy" mean something that is clouded by mist or fog. "Vague" means something that is unclear or imprecise, and "hazy" refers to something that is partially obscured by haze or smoke. Using synonyms like these can help to add variety to your writing and make your descriptions more interesting and evocative.