1. 坚定的：Status 地位, 情形 | Steadfast 坚定的 | Steady 稳固的

2. 坚决的固定的：staysail 支索帆 | steadfast 坚决的固定的 | steadiness number 航向稳定特征数

3. 固定的：stay 停留;延缓 | steadfast 固定的 | steady 稳定的

1. 坚定的;坚信的;坚贞不渝的
If someone is steadfast in something that they are doing, they are convinced that what they are doing is right and they refuse to change it or to give up.

e.g. He remained steadfast in his belief that he had done the right thing.
他一直坚信自己做得对。

adj

1. firm and dependable especially in loyalty

e.g. a steadfast ally
a staunch defender of free speech
unswerving devotion
unswerving allegiance

Synonym: staunchunswerving

2. marked by firm determination or resolution
not shakable

e.g. firm convictions
a firm mouth
steadfast resolve
a man of unbendable perseverence
unwavering loyalty

Synonym: firmsteadystiffunbendableunfalteringunshakableunwavering