Synonyms of faithfulness in English:
faithfulness
See US English definition of faithfulness
See UK English definition of faithfulness
See Spanish definition of fidelidad
noun
1‘she never doubted her husband's faithfulness’
SYNONYMS
fidelity, loyalty, constancy, devotion, trueness, true-heartedness, dedication, commitment, allegiance, adherence
dependability, reliability, trustworthiness, staunchness, steadfastness
historical fealty
2‘the faithfulness of the description’
SYNONYMS
accuracy, precision, exactness, closeness, strictness, fairness, justness, factuality, truth, truthfulness, veracity, authenticity, reliability, dependability
rare veridicality