- 1if you sleep soundly, you sleep very well and very deeply
- 2in a way that is sensible or can be relied on Your information is soundly based. a soundly based conclusion
- 3completely and thoroughly The team was soundly defeated.
- 4strongly; firmly These houses are soundly built.
- 5very well, but not in an excellent way He played soundly.
- 6(of physical punishment) severely He was soundly beaten by his mother.