soothfast

sooth·fast

 (so͞oth′făst′)
adj. Archaic
1. Truthful; honest.
2. True; real.

[Middle English sothfast, from Old English sōthfæst : sōth, truth; see sooth + fæst, fixed, fast; see fast1.]

soothfast

(ˈsuːθˌfɑːst)
adj
1. truthful
2. loyal; true
[from Old English sōthfæst; see sooth, fast1]

sooth•fast

(ˈsuθˌfæst, -ˌfɑst)

adj. Archaic.
1. based on the truth; true.
2. truthful; veracious.
[before 900; Old English sōthfæst]