a. 1. Pertaining to, consisting of, or resembling, a sinew or sinews. [ 1913 Webster ]
The sinewy thread my brain lets fall. Donne. [ 1913 Webster ]
2. Well braced with, or as if with, sinews; nervous; vigorous; strong; firm; tough; as, the sinewy Ajax. [ 1913 Webster ]
A man whose words . . . were so close and sinewy. Hare. [ 1913 Webster ]