The phrase "look black" can invoke different meanings based on the context. When referring to an object or attire, the synonyms could be dark, somber, or blackened. In describing emotions or moods, the phrases could be gloomy, despondent, or morose. "Appear dark" could also be used, indicating that something seems shadowed or obscured. Another possible synonym is "tarnished," which would imply something once shiny or bright has lost its luster. "Seem bleak" could indicate a feeling of hopelessness or despair, while "show sullenness" could signify a sour or sulky attitude. Ultimately, the choice of synonym depends largely on the context in which the phrase is being used.