Sound

The word ‘sound’ is common and yet, at first sight, seems simplistic. In professional contexts, however, it might show up as “a fiscally sound plan” or “a sound understanding of”, uses many people are not familiar with. So, in addition to “make a sound” and “sound like x”, you should learn its adjectival use (~sounder, soundest)

1 sensible; that you can rely on and that will probably give good results.
a person of sound judgement; he gave me some very sound advice; this gives the design team a sound basis for their work; the proposal makes sound commercial sense; their policies are environmentally sound.
Opposite unsound
 
thorough
2 [only before noun] in-depth
a sound knowledge/understanding of …;  He has a sound grasp of the issues.
 
not damaged/hurt
3 in good condition; not damaged, hurt, etc
We arrived home safe and sound; to be of sound mind (= not mentally ill); the house needs attention but the roof is sound.
Opposite unsound
 
sleep
4 [usually before noun] deep and peaceful
to have a sound night’s sleep; to be a sound sleeper
 
good, but not excellent
5 good and accurate, but not excellent
a sound piece of writing; a sound tennis player
 
physical punishment
6 severe
to give somebody a sound beating

ADVERB+ADJECTIVE combinations:  absolutely, basically, fiscally/ financially,  fundamentally, perfectly, reasonably SOUND