faithful
/ˈfāth-fəl/
adjective
steadfast in affection or allegiance : loyal
firm in adherence to promises or in observance of duty : conscientious
given with strong assurance : binding
a faithful friend
noun
church members in full communion and good standing —used with the
the body of believers in Islam —used with the
one who is faithful; especially : a loyal follower, member, or fan
geographical name
geyser that erupts at regular intervals in Yellowstone National Park in northwestern Wyoming