One of the primary colors

of the color of the sky, azure, cerulean, sky-blue.

Hues of blue include: indigo, watchet, sapphire, sapphirine, turquoise, smalt, lapis lazuli, aquamarine, aqua, blue-black, blue-green; royal, Prussian, navy, Dumont's, king's, starch, powder, baby, Paris, cobalt, Antwerp, Haarlem, mineral, Parma, Napoleon, Chinese, robin's egg, pale, teal, sky, slate, light, dark, deep, livid, electric, etc., blue.

*Despondent

depressed, moody, melancholy; see sad 1.

One of the primary colors

blueness, bluing, azure, sky blue; see blue (modif.) 1, color 1.

Heavens

sky, vault of the sky, ether, the wild blue yonder*; see heaven 1, sky, space 1.