English definition of “faithful”
RELATIONSHIP › If your husband, wife, or partner is faithful, they do not have a sexual relationship with anyone else: a faithful husband They remained faithful to each other throughout their long marriage.
LOYAL › always loyal: his trusted and faithful servant
NOT CHANGED › not changing any of the original details, facts, style, etc: Does the film adaptation stay faithful to the novel? → Opposite unfaithful faithfulness noun [U]