3sound adjective
sound·er; sound·est [also more sound; most sound] 1 a : in good condition : solid and strong
▪ a building of sound construction ▪ The bridge is structurally sound.
b : in good health : healthy
▪ a sound mind in a sound body ▪ The tests show that his heart is sound. ▪ My health is sound. [=I am healthy] ▪ (law) He was found to be of sound mind [=sane] when he committed the murder. 2 : free from mistakes : showing good judgment
▪ a sound argument ▪ She used sound reasoning in making the decision. ▪ She gave us some sound advice. ▪ a sound investment 3 always used before a noun : complete or thorough
▪ She has a sound understanding of the system's structure. ▪ The stock market has made a sound recovery. ▪ They gave us a sound beating in yesterday's game. [=they beat/defeated us easily by a large amount] 4 of sleep : deep and restful
▪ She fell into a sound sleep. ▪ I was never a sound sleeper. [=someone who sleeps deeply]
▪ a building of sound construction ▪ The bridge is structurally sound.
b : in good health : healthy
▪ a sound mind in a sound body ▪ The tests show that his heart is sound. ▪ My health is sound. [=I am healthy] ▪ (law) He was found to be of sound mind [=sane] when he committed the murder.
▪ a sound argument ▪ She used sound reasoning in making the decision. ▪ She gave us some sound advice. ▪ a sound investment
▪ She has a sound understanding of the system's structure. ▪ The stock market has made a sound recovery. ▪ They gave us a sound beating in yesterday's game. [=they beat/defeated us easily by a large amount]
▪ She fell into a sound sleep. ▪ I was never a sound sleeper. [=someone who sleeps deeply]
(as) sound as a bell
informal : in excellent condition
▪ There's nothing wrong with your health. You're as sound as a bell. ▪ The car's engine is as sound as a bell.
▪ There's nothing wrong with your health. You're as sound as a bell. ▪ The car's engine is as sound as a bell.
— sound·ly 
/ˈsaʊndli/ adverb
▪ I slept more soundly last night than I have in a while. ▪ an argument soundly based on logic ▪ We were soundly beaten/defeated in yesterday's game.
/ˈsaʊndli/ adverb ▪ I slept more soundly last night than I have in a while. ▪ an argument soundly based on logic ▪ We were soundly beaten/defeated in yesterday's game.
— sound·ness /ˈsaʊndnəs/ noun [noncount]
/ˈsaʊndnəs/ noun [noncount]
