| insolent | (adjective) marked by casual disrespect | Synonyms: flip, impudent, snotty-nosed |
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| (adjective) unrestrained by convention or propriety | Synonyms: audacious, bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen |
| obsolescent | (adjective) becoming obsolete | - |
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| obsolete | (adjective) no longer in use | Synonyms: disused |
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| (adjective) old; no longer valid or fashionable | Synonyms: out-of-date, outdated, superannuated |
| 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 |