Nubilate is a rarely used word which means 'to obscure' or 'to make cloudy'. It is a formal word and may not be used often in day-to-day conversation. However, there are several synonyms for nubilate which can be employed in place of this word. Some of the common synonyms for nubilate are 'cloud', 'fog', 'obfuscate', 'shroud', 'veil', 'mist', 'haze', and 'dim'. Cloud is perhaps the most commonly used synonym, while haze and mist are used in specific contexts such as weather. Obfuscate and dim are often used in intellectual discussions to imply the lack of clarity or understanding.