| sole | (adjective) being the only one; single and isolated from others | Synonyms: lone, lonesome, only, solitary |
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| (adjective) not divided or shared with others | Synonyms: exclusive |
| soled | (adjective) having a sole or soles especially as specified; used in combination | - |
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| soleless | (adjective) having no sole | - |
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| solemn | (adjective) dignified and somber in manner or character and committed to keeping promises | Synonyms: grave, sedate, sober |
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| (adjective) characterized by a firm and humorless belief in the validity of your opinions | Synonyms: earnest, sincere |