soundness
Soundness (noun) means the state of being healthy, solid, or in good condition.
Etymology
The word came into English via Middle English soundenes and soundnes, which developed from Old English *sundnes and *ġesundnes (found in onsundnes), in turn from Proto-West Germanic *sundnassī (“soundness, health”). It can be broken down as sound + -ness, and is cognate with West Frisian sûnens (“soundness, health”), Middle Low German suntnisse (“soundness, health”), Middle High German suntnisse (“soundness, health”) and German Gesundnis (“health”).