| ineffable | (adjective) defying expression or description | Synonyms: indefinable, indescribable, unspeakable, untellable, unutterable |
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| (adjective) too sacred to be uttered | Synonyms: unnameable, unspeakable, unutterable |
| ineffably | (adverb) to an inexpressible degree | Synonyms: indescribably, inexpressibly, unspeakably, unutterably |
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| ineffaceability | (noun) The quality of being difficult to delete, remove, wash away, blot out, or efface. | Synonyms: indelibility |
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| ineffective | (adjective) not producing an intended effect | Synonyms: ineffectual, uneffective |
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| (adjective) lacking in power or forcefulness | Synonyms: ineffectual, unable |
| (adjective) lacking the ability or skill to perform effectively; inadequate | Synonyms: inefficient |
| ineffectively | (adverb) in an ineffective manner | Synonyms: inefficaciously |
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| ineffectiveness | (noun) lacking the power to be effective | Synonyms: ineffectuality, ineffectualness |
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| ineffectual | (adjective) not producing an intended effect | Synonyms: ineffective, uneffective |
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| (adjective) lacking in power or forcefulness | Synonyms: ineffective, unable |
| (adjective) producing no result or effect | Synonyms: futile, meaningless, otiose, unavailing |
| ineffectuality | (noun) lacking the power to be effective | Synonyms: ineffectiveness, ineffectualness |
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| ineffectually | (adverb) in an ineffectual manner | - |
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| ineffectualness | (noun) lacking the power to be effective | Synonyms: ineffectiveness, ineffectuality |
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| inefficacious | (adjective) lacking the power to produce a desired effect | - |
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| inefficaciously | (adverb) in an ineffective manner | Synonyms: ineffectively |
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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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| inefficient | (adjective) not producing desired results; wasteful | - |
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| (adjective) lacking the ability or skill to perform effectively; inadequate | Synonyms: ineffective |
| inefficiently | (adverb) in an inefficient manner | - |
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