| ailing | (adjective) somewhat ill or prone to illness | Synonyms: indisposed, peaked, poorly, seedy, sickly, under the weather, unwell |
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| failing | (adjective) below acceptable in performance | - |
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| prevailing | (adjective) most frequent or common | Synonyms: dominant, predominant, prevalent, rife |
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| unavailing | (adjective) producing no result or effect | Synonyms: futile, ineffectual, meaningless, otiose |
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| unfailing | (adjective) tireless | Synonyms: unflagging |
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| (adjective) always able to supply more | - |
| (adjective) not liable to failure | Synonyms: foolproof |
| wailing | (adjective) vocally expressing grief or sorrow or resembling such expression | Synonyms: lamenting, wailful |
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