efficacious | (adjective) marked by qualities giving the power to produce an intended effect | - |
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(adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effective, effectual |
efficient | (adjective) being effective without wasting time or effort or expense | - |
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(adjective) able to accomplish a purpose; functioning effectively | Synonyms: effective |
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 |