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 ]