faithful
n.n. staying loyal to a person, belief, or organization. It also describes something that is a very accurate copy of an original.
n. steadfast in allegiance or duty; loyal. Also used to describe a copy or reproduction that is strictly accurate and true to the original source.
He remained faithful to his wife for fifty years.
The film director wanted to create a faithful adaptation of the novel without changing the ending.
Despite the political pressure to conform, she remained faithful to her principles, refusing to sign the document that would compromise her integrity.
From Middle English feithful, equivalent to faith + -ful.
Often followed by the preposition 'to'. When describing a copy, it implies a high degree of precision and attention to detail.
He is faithful with his promisesHe is faithful to his promisesThe adjective faithful typically takes the preposition 'to' when indicating the object of loyalty or adherence.