steadfast
STED-fastadjMeaning firm and loyal; not changing or giving way
Memory hook STEADY, held FAST in its place. Every stormy night, keeper Tia stays at her post and keeps the lighthouse lamp burning for the boats: she is steadfast.
Through every losing season, the team’s steadfast fans filled the bleachers.
In context Friends came and went over the years, but Lila remained steadfast; whenever Rosa needed help, Lila was the first to show up.
Similar loyal, faithful, firm, unwavering
Opposite fickle, disloyal, wavering
From Old English stedefæst, “fixed in its place”: stede (place) + fæst (fixed, firm).