noun
1.
Synonyms: health , haleness, healthiness, wholeness
Antonyms: unsoundness
2.
Synonyms: stability , firmness, security, stableness, steadiness, strength
3.
Synonyms: wit 2, lucidity, ||marbles, mind, reason, saneness, sanity, sense(s)
Related Word: level-headedness, sensibleness
Idioms: sound mind, soundness of mind
Antonyms: unsoundness