Etymology
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steadfast (adj.)

Old English stedefæst "secure in position, steady, firm in its place," from stede (see stead) + fæst (see fast (adj.)); similar formation in Middle Low German stedevast, Old Norse staðfastr "steadfast, firm; faithful, staunch, firm in one's mind." Of persons, in English, "unshakable, stubborn, resolute" from c. 1200. Related: Steadfastly, steadfastness.

updated on April 06, 2014

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Definitions of steadfast from WordNet

steadfast (adj.)
marked by firm determination or resolution; not shakable;
steadfast resolve
Synonyms: firm / steady / stiff / unbendable / unfaltering / unshakable / unwavering
steadfast (adj.)
firm and dependable especially in loyalty;
a steadfast ally
Synonyms: staunch / unswerving
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.