faithfulPronunciation: /ˈfeɪθfʊl, -f(ə)l/Translate faithful | into French | into German | into Italian | into Spanish Definition of faithful adjective 1remaining loyal and steadfast:the city has always been faithful to the Conservative party employees who had notched up decades of faithful service (of a spouse or partner) never having a sexual relationship with anyone else:her husband was faithful to her (of an object) reliable:my faithful compass 2true to the facts or the original:the film was faithful to the book noun (as plural noun the faithful) those who are faithful to a particular religion or political party:a muezzin called the faithful to prayerfaithful in other Oxford dictionaries Definition of faithful in the US English dictionary