Middle English, brave, stubborn, from Anglo-French esturdi stunned, from past participle of esturdir to stun, from Vulgar Latin *exturdire, from Latin ex- + Vulgar Latin *turdus simpleton, from Latin turdus thrush
strongstoutsturdystalwarttoughtenacious mean showing power to resist or to endure. strong may imply power derived from muscular vigor, large size, structural soundness, intellectual or spiritual resources. stout suggests an ability to endure stress, pain, or hard use without giving way.