When it comes to describing colors, "purplish-white" is a specific shade that can be difficult to find the perfect synonym for. Some options include lavendar, lilac, periwinkle, mauve, and even dusty rose. These shades all have a mix of purple and white tones, with variations in brightness and depth. Another possibility is to use phrases like "a pale, tinted white" or "a light purple hue". Depending on the context, it may also be appropriate to use more general color descriptions like "pastel", "pale" or "light". Ultimately, the synonym chosen should reflect the specific tone and mood being conveyed in the description.