STEADFAST

adj. resolute, determined, persevering, resolved, single-minded, steady, unflinching, unfaltering, unwavering, unswerving, indefatigable, dependable, immovable, stable, firm, fixed, constant, persistent, unflagging, tireless, enduring, dedicated, deep-rooted, faithful, true, loyal, staunch For years Janet has been steadfast in supporting the cause Stephen was a steadfast friend and will never be forgotten.