noun / adjective
stalwart
STAWL-wurt/stˈɔlwɝt/
Loyal and dependable in support.
She remains a stalwart supporter of the library.

Etymology
Old English stælwierðe meant “good, serviceable.” Later senses of physical strength and resoluteness connect this practical usefulness with strength of character: being loyal and dependable.
In context
a big thank you to the Carnegie Corporation of New York who has been our long-standing stalwart funder of of this work
More examples
- Party stalwarts volunteer at every election.
- His stalwart friendship helps her through the crisis.
- The club honors its stalwarts for decades of service.
Forms
stalwart · stalwarts