Wordfast

Shamefast is one of a group and family of words, in all which fast constitutes the second syllable, thus steadfast (A.S. Staðolfæst), wordfast; and those good old words rootfast and rootfastness, which we have now let go."

"Aye, Lord of Deira, I hie back at dawning; Wikhelm is wordfast, Despite of her scorning

Thereto said Biorn: " Yea, I know thee now, Allfather! But a wordfast man am I, And pledged to serve the White Christ by my vow.