sound [2]
adj
1 free from damage, injury, decay, etc.
2 firm; solid; substantial
a sound basis
3 financially safe or stable
a sound investment
4 showing good judgment or reasoning; sensible; wise
sound advice
5 valid, logical, or justifiable
a sound argument
6 holding approved beliefs; ethically correct; upright; honest
7 (of sleep) deep; peaceful; unbroken
8 thorough; complete
a sound examination
9 (Law) (of a title, etc.) free from defect; legally valid
10 constituting a valid and justifiable application of correct principles; orthodox
sound theology
a (of a deductive argument) valid
b (of an inductive argument) according with whatever principles ensure the high probability of the truth of the conclusion given the truth of the premises
c another word for →
consistent →
5b
adv
12 soundly; deeply: now archaic except when applied to sleep
(Old English sund; related to Old Saxon gisund, Old High German gisunt)
♦
soundly adv
♦
soundness n