What does the word “faithfulness or faithful” mean?

The word faithfulness roots from the word called “faith” or to have faith in God.

He or she who has faith in God, Putting his trust in God’s will, moral principle, moral instructions or commandments, such a person will end up living a life which displays the attitude of faithfulness.

Noun:

faithfulness, – the quality of being faithful; fidelity. “faithfulness in marriage“.

synonyms:

fidelity, loyalty, constancy, devotion, trueness, true-heartedness, dedication, commitment, allegiance, adherence; dependability, reliability, trustworthiness, steadfastness;

“she never doubted her husband’s faithfulness”.

accuracy, precision, exactness, closeness, strictness, fairness, justness, factuality, truth, truthfulness, veracity, authenticity, reliability, dependability; rareveridicality