na-adjective, noun
faithful; loyal; devoted; true
Describes unwavering loyalty, fidelity, or faithfulness to a person, duty, principle, or original. Often used for people, translations, or reproductions.
彼は会社に忠実な社員だ。
He is an employee loyal to the company.
この翻訳は原文に忠実である。
This translation is faithful to the original text.