Adjective steadfast has 2 senses
  1. firm, steadfast, steady, unbendable, unfaltering, unshakable, unwavering - marked by firm determination or resolution; not shakable; "firm convictions"; "a firm mouth"; "steadfast resolve"; "a man of unbendable perseverence"; "unwavering loyalty"
    Antonym: irresolute (indirect, via resolute)
  2. steadfast, staunch, unswerving - firm and dependable especially in loyalty; "a steadfast ally"; "a staunch defender of free speech"; "unswerving devotion"; "unswerving allegiance"
    Antonym: inconstant (indirect, via constant)
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