1.
If someone is soundly defeated or beaten, they are severely defeated or beaten.
Duke was soundly defeated in this month's Louisiana governor's race.
ADV: ADV -ed
2.
If a decision, opinion, or statement is soundly based, there are sensible or reliable reasons behind it.
Changes must be soundly based in economic reality.
ADV: ADV -ed [approval]
3.
If you sleep soundly, you sleep deeply and do not wake during your sleep.
How can he sleep soundly at night?...
She was too soundly asleep to hear Stefano's return.
= deeply
ADV: ADV after v, ADV adj