"truthful," Old English soðfæst "true, trustworthy, honest, just, righteous;" see sooth (n.) + fast (adj). Related: Old English soðfæstnes "truthfulness, fairness, fidelity;" soðfæstlic "true, sincere;" soðfæstlice "truly, honestly."
soon
soot
sooterkin
sooth
soothe
soothfast
soothing
soothsay
soothsayer
sooty
sop
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