| sound | (adjective) financially secure and safe | - |
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| (adjective) in good condition; free from defect or damage or decay | - |
| (adjective) complete; thorough | - |
| (adjective) (of sleep) deep and complete | Synonyms: heavy, profound, wakeless |
| (adjective) in excellent physical condition | Synonyms: good |
| (adjective) exercising or showing good judgment | Synonyms: healthy, intelligent, level-headed, levelheaded |
| (adjective) free from moral defect | - |
| (adjective) vigorous or severe | - |
| (adjective) having legal efficacy or force | Synonyms: effectual, legal |
| (adjective) logically valid | Synonyms: reasoned, well-grounded |
| soundable | (adjective) (of depth) capable of being sounded or measured for depth | Synonyms: fathomable, plumbable |
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| sounding | (adjective) making or having a sound as specified; used as a combining form | - |
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| (adjective) having volume or deepness | - |
| (adjective) appearing to be as specified; usually used as combining forms | Synonyms: looking |
| soundless | (adjective) marked by absence of sound | Synonyms: silent, still |
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| soundproof | (adjective) impervious to, or not penetrable by, sound | - |
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