Adjective steadfast has 2 senses
- 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)
- 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)
,