WordNet sense 1 (a group of people who adhere to a common faith and habitually attend a given church):

congregation, fold

WordNet sense 2 (devoted (sometimes fanatically) to a cause or concept or truth):

true

WordNet sense 3 (unwavering in devotion to friend or vow or cause):

fast, firm, loyal

WordNet sense 4 (marked by fidelity to an original):

close

WordNet sense 5 (conforming exactly or almost exactly to fact or to a standard or performing with total accuracy):

accurate