soundness
n. US //ˈsaʊndnəs// UK //sˈaʊndnəs// sound·ness
From Middle English soundenes, soundnes, from Old English sundnes, ġesundnes (attested in onsundnes), from Proto-West Germanic *sundnassī (“soundness, health”); equivalent to sound + -ness. Cognate with West Frisian sûnens (“soundness, health”), Middle Low German suntnisse (“soundness, health”), Middle High German suntnisse (“soundness, health”), German Gesundnis (“health”).