adj. & adv.
adj. 1 healthy; not diseased or injured. 2 (of an opinion or policy etc.) correct, orthodox, well-founded, judicious. 3 financially secure (a sound investment). 4 undisturbed (a sound sleeper). 5 severe, hard (a sound blow).
adv. soundly (sound asleep). soundly adv. soundness n.
[ ME sund, isund f. OE gesund f. WG ]