Definitions of stalwart:

• noun:   a person who is loyal to their allegiance (especially in times of revolt)
• adjective:   dependable

  Example: "The stalwart citizens at Lexington"

• adjective:   used especially of persons

  Example: "A stalwart knight"

• adjective:   having rugged physical strength; inured to fatigue or hardships

  Example: "Proud of her tall stalwart son"