[sted-fast, -fahst, -fuhst]
fixed in direction; steadily directed: a steadfast gaze.
firm in purpose, resolution, faith, attachment, etc., as a person: a steadfast friend.
unwavering, as resolution, faith, adherence, etc.
firmly established, as an institution or a state of affairs.
firmly fixed in place or position.
Steadfast - Merriam-Webster Online
very devoted or loyal to a person, belief, or cause : not changing.
Full Definition of STEADFAST.
1. a : firmly fixed in place : immovable. b : not subject to change ...