| arsenical | (adjective) relating to or containing arsenic | - |
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| arsenious | (adjective) relating to compounds in which arsenic is trivalent | - |
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| senile | (adjective) mentally or physically infirm with age | Synonyms: doddering, doddery, gaga |
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| senior | (adjective) older; higher in rank; longer in length of tenure or service | - |
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| (adjective) used of the fourth and final year in United States high school or college | Synonyms: fourth-year |
| (adjective) advanced in years; (`aged' is pronounced as two syllables) | Synonyms: aged, elderly, older |
| worsening | (adjective) changing for the worse | - |
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