stalwart

a person who is loyal to their allegiance (especially in times of revolt)

having rugged physical strength; inured to fatigue or hardships; "hardy explorers of northern Canada"; "proud of her tall stalwart son"; "stout seamen"; "sturdy young athletes"

dependable; "the stalwart citizens at Lexington"; "a stalwart supporter of the UN"; "stout hearts"

used especially of persons; "a stalwart knight"; "a stouthearted fellow who had an active career in the army"