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1. Loyal and resolute: a stalwart ally; stalwart support.
2. Strong and imposing: a stalwart oak tree.
One who steadfastly supports an organization or cause: party stalwarts.

[Middle English, alteration of stalworth, from Old English stǣlwierthe, serviceable, probably alteration of *statholwierthe, steadfast : stathol, foundation; see staddle + weorth, valuable; see wer- in Indo-European roots.]

stal′wart·ly adv.
stal′wart·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.stalwartness - the property of being strong and resolute
strength - the property of being physically or mentally strong; "fatigue sapped his strength"
References in classic literature ?
In his tall stalwartness Adam Bede was a Saxon, and justified his name; but the jet-black hair, made the more noticeable by its contrast with the light paper cap, and the keen glance of the dark eyes that shone from under strongly marked, prominent and mobile eyebrows, indicated a mixture of Celtic blood.
The Kurds, unlike other factions in Iraq, have proven their stalwartness to fight, and lay down their lives, to defeat ISIS.
67) Those reports of Canada's continued stalwartness within the Empire provided an important source of guidance for Crawford and other British policy-makers.
Looking back upon our own short history in the United States, one need not be a scholar to realize that practically every conflict could have been avoided if diplomacy and foresight had prevailed over the urge to prove one's (or the nation's) stalwartness.