Webster’s Revised Unabridged Dictionary · 1913
Sinewy
Sin′ew·y (·y̆), a. 1. Pertaining to, consisting of, or resembling, a sinew or sinews.
The sinewy thread my brain lets fall. Donne.
2. Well braced with, or as if with, sinews; nervous; vigorous; strong; firm; tough; as, the sinewy Ajax.
A man whose words . . . were so close and sinewy. Hare.