faithful /ˈfeɪθ.fl̩/adjective 7noun 2forms 4 adjective7 •always staying true to a person or an idea and ready to support themMy dog is very faithful: he doesn't like to be petted by anybody else. •Reliable; worthy of trust.My servant is very faithful. •Engaging in sexual relations only with one's spouse or long-term sexual partner.They had been faithful to each other all of their married life. •Consistent with reality.I would consider that a very faithful reproduction. •Having faith.The application of the old discipline, say the conservatives, would probably produce a smaller but more faithful Church. — 2009 •Injective in specific contexts, e.g. of representations in representation or functors in category theory. •Of a module, whose annihilator is zero. noun2 •The practicing members of a religion or followers of a cause.The faithful pray five times a day.The annual meeting was attended by the long-term party faithful. •Someone or something that is faithful or reliable.Earlier this year, as the recession put a damper on ticket sales, Maxwell said the easy route would have been to go for the tried-and-true old faithfuls. — 2009 formsfaithfuls · more faithful · faithfulest · most faithful