Solence

Solence: noun. The quality of having particularly good manners, making this word the exact opposite of the word insolence. Most probably, this word is derived from the word sol (the sun), as one's good manners can make another's day far more bright. However, it has been suggested by societal cynics that really, the word solence was derived from the word "solvency," which they believe is equally if not more important in the modern world than having good manners.