Source : Webster's Revised Unabridged Dictionary (1913)

Stalwart \Stal"wart\, Stalworth \Stal"worth\, a. [OE. stalworth,
   AS. st[ae]lwyr[eth] serviceable, probably originally, good at
   stealing, or worth stealing or taking, and afterwards
   extended to other causes of estimation. See {Steal}, v. t.,
   {Worth}, a.]
   Brave; bold; strong; redoubted; daring; vehement; violent.
   ``A stalwart tiller of the soil.'' --Prof. Wilson.

         Fair man be was and wise, stalworth and bold. --R. of
                                                  Brunne.

   Note: Stalworth is now disused, or bur little used, stalwart
         having taken its place.

Source : WordNet®

stalwart
     adj 1: 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" [syn: {hardy}, {stout}, {sturdy}]
     2: dependable; "the stalwart citizens at Lexington"; "a
        stalwart supporter of the UN"; "stout hearts" [syn: {stout}]
     3: used especially of persons; "a stalwart knight"; "a
        stouthearted fellow who had an active career in the army"
        [syn: {stouthearted}]
     n : a person who is loyal to their allegiance (especially in
         times of revolt) [syn: {loyalist}]