The Collaborative International Dictionary of English v.0.48:
Thewed \Thewed\ (th[=u]d), a. 1. Furnished with thews or muscles; as, a well-thewed limb. [1913 Webster] 2. Accustomed; mannered. [Obs.] --John Skelton. [1913 Webster] Yet would not seem so rude and thewed ill. --Spenser. [1913 Webster]