| baneful | (adjective) deadly or sinister | Synonyms: baleful |
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| (adjective) exceedingly harmful | Synonyms: deadly, pernicious, pestilent |
| benefic | (adjective) exerting a favorable or beneficent influence | - |
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| beneficed | (adjective) having a benefice | - |
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| beneficent | (adjective) doing or producing good | - |
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| (adjective) generous in assistance to the poor | Synonyms: benevolent, eleemosynary, philanthropic |
| beneficial | (adjective) promoting or enhancing well-being | Synonyms: good |
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| beneficiary | (adjective) having or arising from a benefice | - |
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| 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 |
| 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 |
| 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 |
| inefficacious | (adjective) lacking the power to produce a desired effect | - |
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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 |
| nefarious | (adjective) extremely wicked | Synonyms: villainous |
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| ninefold | (adjective) having nine units or components | Synonyms: nine-fold, nonuple |
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| noneffervescent | (adjective) not effervescent | - |
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| (adjective) not sparkling | Synonyms: still |
| tuneful | (adjective) having a musical sound; especially a pleasing tune | Synonyms: melodious |
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| unbeneficed | (adjective) not having a benefice | - |
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| uneffective | (adjective) not producing an intended effect | Synonyms: ineffective, ineffectual |
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| untuneful | (adjective) not having a musical sound or pleasing tune | Synonyms: tuneless, unmelodious |
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