| ineffaceability | (noun) The quality of being difficult to delete, remove, wash away, blot out, or efface. | Synonyms: indelibility |
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| ineffectiveness | (noun) lacking the power to be effective | Synonyms: ineffectuality, ineffectualness |
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| ineffectuality | (noun) lacking the power to be effective | Synonyms: ineffectiveness, ineffectualness |
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| ineffectualness | (noun) lacking the power to be effective | Synonyms: ineffectiveness, ineffectuality |
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| inefficaciousness | (noun) a lack of efficacy | Synonyms: inefficacy |
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| inefficacy | (noun) a lack of efficacy | Synonyms: inefficaciousness |
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| inefficiency | (noun) unskillfulness resulting from a lack of efficiency | - |
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| minefield | (noun) a region in which explosives mines have been placed | - |
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| porcupinefish | (noun) spines become erect when the body is inflated; worldwide in warm waters | Synonyms: Diodon hystrix, porcupine fish |
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