Sincerity (noun)

1. The quality of being sincere; honesty and genuineness.
2. The state of being free from pretense, deceit, or hypocrisy.

Origin:

Late middle english (in the sense "purity, freedom from hypocrisy"): from old french sincerite, or via latin from sincerus "pure, genuine".

Examples:

1. He spoke with sincerity.
2. She doubted the sincerity of his apology.
3. His sincerity was evident in his actions.
4. The sincerity of his words touched her.
5. He was known for his sincerity and honesty.