faithful

nouns

any loyal and steadfast following
is a type of (narrower)
a group of followers or enthusiasts
a group of people who adhere to a common faith and habitually attend a given church

adjectives

steadfast in affection or allegiance
"years of faithful service"; "faithful employees"; "we do not doubt that England has a faithful patriot in the Lord Chancellor"
is derived from
antonym
is similar to
unwavering in devotion to friend or vow or cause
"a firm ally"; "loyal supporters"; "the true-hearted soldier...of Tippecanoe"- Campaign song for William Henry Harrison; "fast friends"
is similar to
devoted (sometimes fanatically) to a cause or concept or truth
"true believers bonded together against all who disagreed with them"
see also
steadfast in purpose or devotion or affection
"a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star"
see also
consistent with fact or reality; not false
"the story is true"; "it is undesirable to believe a proposition when there is no ground whatever for supposing it true"- B. Russell; "the true meaning of the statement"
see also
worthy of trust or belief
"a trustworthy report"; "an experienced and trustworthy traveling companion"
is an attribute of
the quality of being faithful
marked by fidelity to an original
"a close translation"; "a faithful copy of the portrait"; "a faithful rendering of the observed facts"
is derived from
not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend
"he remained faithful to his wife"
is derived from
antonym
is similar to
sexually faithful
"she was true to her significant other"