from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Having a blue color very low in chroma.
from the GNU version of the Collaborative International Dictionary of English
- adj. Of the color of lavender; pale blue with a slight mixture of gray.
from The Century Dictionary and Cyclopedia
- Lavender-colored; pale-blue, with a slight mixture of gray.
Latin caesius ("bluish-grey"); probably akin to Latin caelum ("sky"); see celestial. (Wiktionary)
I can add larcenious (for the more usual larcenous), aerious (which the 17th century used for aerial), and caesious.