Tra từ faithful - Từ điển Oxford Advanced Learner 8th

faith·ful BrE [ˈfeɪθfl] NAmE [ˈfeɪθfl] adjective
1. staying with or supporting a particular person, organization or belief
Syn: ↑loyal
•a faithful servant/friend/dog
• She was rewarded for her 40 years' faithful service with the company.
• I have been a faithful reader of your newspaper for many years.
•~ to sb/sth He remained faithful to the ideals of the party.
2. the faithfulnoun plural people who believe in a religion; the loyal supporters of a political party
•The president will keep the support of the party faithful.
3. (of a wife, husband or partner)~ (to sb) not having a sexual relationship with anyone else
Opp: ↑unfaithful
4. true and accurate; not changing anything
•a faithful copy/account/description
•~ to sth His translation manages to be faithful to the spirit of the original.
5. only before noun able to be trusted; that you can rely on
•my faithful old car
Derived Word: ↑faithfulness

Thesaurus:
faithful [faithful faithfulness] adj.
•He has been a faithful friend to me.
loyal • • dedicated • • devoted • • true • • staunch • • reliable • • trusted •
faithful/loyal/dedicated/true to sb/sth
a faithful/loyal/devoted/true/staunch/reliable/trusted friend
faithful/loyal/reliable service
Faithful or loyal? There is only a slight difference of emphasis: a loyal friend/servant remains loyal as a matter of principle; a faithful friend/servant remains faithful from affection.

Example Bank:
•He had remained entirely faithful to his wife.
•He has been a very faithful friend to me.
•The film is quite faithful to the original novel.
•soldiers who stayed faithful to the king
•He remained faithful to the ideals of the party until his death.
•His faithful old dog sat by his feet.
•It was a faithful representation of his work.
•She was rewarded for 40 years' faithful service with the company.
•The translation is faithful to the spirit of the original.
•a faithful account of the events leading up to the tragedy
•a faithful worker/correspondent