late 14c., "resolute, determined," Scottish variant of stalworth, from Old English stælwierðe "good, serviceable," probably a contracted compound of staðol "base, foundation, support; stability, security" (from Proto-Germanic *stathlaz, from PIE root *sta- "to stand, make or be firm") + wierðe "good, excellent, worthy" (see worth). Another theory traces the first element of stælwierðe to Old English stæl "place," from Proto-Germanic *stælaz.
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