Definition of "Faithful" :

noun: a group of people who adhere to a common faith and habitually attend a given church

noun: any loyal and steadfast following

adjective: marked by fidelity to an original

"A faithful copy of the portrait."

adjective: steadfast in affection or allegiance

"Years of faithful service."

adjective: not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend

"He remained faithful to his wife."