For years Janet has been steadfast in supporting the cause. Stephen was a steadfast friend and will never be forgotten.
Advanced English Dictionary
+adjective ~ (in sth) (literary, approving) not changing in your attitudes or aims: steadfast loyalty + He remained steadfast in his determination to bring the killers to justice. steadfastly adverb: She steadfastly refused to speak. steadfastness noun [U]
Random quote: There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.: Albert Einstein