standfast
/ˈstændfɑːst/Definitions
1. verb
to remain steadfast and firm in one’s position, resolve, or opinions
“The protesters decided to standfast against the government’s new laws.”
2. noun
a person or thing that stands firm or resists pressure
“The union representative was a standfast in the face of layoffs.”
3. adverb
firmly or steadfastly
“She stood standfast in her decision to quit the job.”