stead·fast /ˈstɛdˌfæst, -ˌfɑst, -fəst/ Pronunciation Key - Show Spelled Pronunciation[sted-fast, -fahst, -fuhst] Pronunciation Key - Show IPA Pronunciation
1. fixed in direction; steadily directed: a steadfast gaze.
2. firm in purpose, resolution, faith, attachment, etc., as a person: a steadfast friend.
3. unwavering, as resolution, faith, adherence, etc.
4. firmly established, as an institution or a state of affairs.
5. firmly fixed in place or position.
[Origin: bef. 1000; ME stedefast, OE stedefæst. See stead, fast1]
—Synonyms 2. sure, dependable, reliable, constant, unwavering. Steadfast, staunch, steady imply a sureness and continuousness that may be depended upon. Steadfast literally means fixed in place, but is chiefly used figuratively to indicate undeviating constancy or resolution: steadfast in one's faith. Staunch literally means watertight, as of a vessel, and therefore strong and firm; figuratively, it is used of loyal support that will endure strain: a staunch advocate of free trade. Literally, steady is applied to that which is relatively firm in position or continuous in movement or duration: a steady flow; figuratively, it implies sober regularity or persistence: a steady worker. 4, 5. stable.
—Antonyms 2. capricious, variable.