Bay, concept, blare, articulate, disease-free, able to pay its debts, authoritative, astute, deep, absolute, determine, canvass, canvass, (sea) passage, and arm (of the sea) are all synonyms for sound. Unhealthy, unsafe, and flimsy are these antonyms of sound. And here are another 173 synonyms for sound.
1. concept
2. resound
3. voice
4. toned
5. solvent
6. valid
7. reliable
8. deep
9. regular
10. determine
11. survey
12. check
13. channel