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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.stalwartness - the property of being strong and resolute
strength - the property of being physically or mentally strong; "fatigue sapped his strength"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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 Women in Construction are true examples of stalwartness in an industry that is primarily dominated by men,' says Peggy Smedley, editorial director of Constructech magazine and president of Specialty Publishing Media.
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.