Antonyms of adj steadfast

2 senses of steadfast

Sense 1
firm, steadfast, steady, stiff, 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")

INDIRECT (VIA resolute) -> irresolute -- (uncertain how to act or proceed; "the committee was timid and mediocre and irresolute")

Sense 2
steadfast, staunch, unswerving -- (firm and dependable especially in loyalty; "a steadfast ally"; "a staunch defender of free speech"; "unswerving devotion"; "unswerving allegiance")

INDIRECT (VIA constant) -> inconstant -- (likely to change frequently often without apparent or cogent reason; variable; "inconstant affections"; "an inconstant lover"; "swear not by...the inconstant moon"- Shakespeare)

Similarity of adj steadfast

2 senses of steadfast

Sense 1
firm, steadfast, steady, stiff, 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")
       => resolute (vs. irresolute) -- (firm in purpose or belief; characterized by firmness and determination; "stood resolute against the enemy"; "faced with a resolute opposition"; "a resolute and unshakeable faith")

Sense 2
steadfast, staunch, unswerving -- (firm and dependable especially in loyalty; "a steadfast ally"; "a staunch defender of free speech"; "unswerving devotion"; "unswerving allegiance")
       => constant (vs. inconstant) -- (steadfast in purpose or devotion or affection; "a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star")