A broken mirror can be described by a number of different synonyms. Some of these synonyms include shattered glass, fractured reflection, cracked surface, damaged looking glass, splintered mirror, ruined image, and broken reflective material. Each of these phrases conveys the same basic idea - that the mirror in question is no longer whole or functioning properly. Depending on the context, different synonyms may be more appropriate or more evocative than others. For example, shattered glass might be a good choice for a crime scene or accident report, while ruined image might be a more poetic description for a broken mirror in a personal essay or memoir.