sinewy

adjective3

1. •
   Tough; having strong sinews.

   • I haue beene wooed, as I intreat thee now, Euen by the sterne, and direfull God of warre, VVhose sinowie necke in battel nere did bow, VVho conquers where he comes in euery iarre; […] — 1594
2. •
   Possessing physical strength and weight; rugged and powerful.

   • Worthy fellows, and like to prove most sinewy swordmen — 1604
3. •
   (figurative) Having or showing nervous strength.