Sad night can be described in various ways using different synonyms. A melancholic night could describe a sad atmosphere accompanied by a sense of long-term sadness. A mournful night could suggest solemnity and deep sorrow often associated with a tragic event. A gloomy night could describe a sense of darkness and sadness combined. A disheartening night could reflect a feeling of hopelessness and despair. Similarly, a somber night could suggest a sense of gravity, seriousness, or even sadness often associated with a situation of great sorrow. These synonyms can help add variety to writing and convey a more nuanced sense of emotion.