When it comes to describing colors, "grey-blue" can sometimes be a tricky shade to capture in words. Luckily, there are plenty of synonyms and similar phrases that can help paint a clearer picture. Some possible options include "slate blue," "steel blue," "stormy blue," "dusk blue," "powder blue," "misty blue," and "ashen blue." Each of these terms suggests a similar balance of coolness and neutrality, with a hint of blue that's tempered by a softness or muted quality. By experimenting with different descriptors and shades, it's possible to find the perfect vocabulary to convey the nuances of the color and create a vivid mental image for readers or listeners.