stalwart
stal-wart
adjective
Loyal, reliable, and hardworking, especially in supporting a cause or organisation.
"She was a stalwart supporter of the local charity."
noun
A loyal, reliable, and hardworking person, especially in a cause or organisation.
"He was a true stalwart of the community."
Thesaurus
Synonyms: stout, resolute, courageous, stouthearted, brave, sturdy, hardy, robust, loyalist