Steel blue is a color that often reminds us of strength and durability. Its cool, calm and serene hue also gives a touch of sophistication and elegance to any look or space. However, if you are looking for some synonyms to describe this shade, you could say it is akin to azure, slate blue, navy, gunmetal, or even the lighter sky blue. Each of these variations gives a slightly different feel and mood, but all are equally beautiful in their own right. So whether you prefer a darker, moodier shade or a lighter, more whimsical feel, there is sure to be a synonym for steel blue that matches your aesthetic preferences.