Faithful
Part of speech: noun
Definition: The practicing members of a religion or followers of a cause.
Part of speech: adjective
Definition: loyal; adhering firmly to person or cause having faith reliable; worthy of trust consistent with reality
Example sentence: The man of character is the persistent man, the man who is faithful to his own word, his own convictions, his own affections.
Trusty
Part of speech: adjective
Definition: Reliable or trustworthy.
Part of speech: noun
Definition: A trusted person, especially a prisoner who has been granted special privileges.