| 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 |