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-2 in the Appendix of Indo-European roots.]
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