Faithfulness

What is faithfulness?
The Mirriam Webster Dictionary gives no definition for faithfulness. It defines faith as an allegiance to someone or something. And faithlessness as lack of reliability. So I guess we could sort of combine the two and say that faithfulness is to be reliable to someone you have sworn allegiance to. Or to keep your commitments.

So how can I be faithful to God? By striving to obey Him in all that I do.
What does He require of me? To love Him..
What are His commandments. To love Him with all my heart, all my soul, and with all might might. And to love my neighbor as myself.