2. **Ineffectual**(徒劳无益的) -- 强调努力/尝试的徒劳性 -- 多修饰人或其行为,带有"无能"的隐含意味 -- 例:His ineffectual attempts to fix the leak only made it worse. ...(以上内容有节略,please sign in for more)500
【Ineffective】 , 【ineffectual】 , 【inefficient】 , 【inefficacious】 mean not producing or incapable of producing results. (Except for this denial of production or capacity for production, these adjectives correspond in their applications and implications to the affirmative adjectives as discriminated at EFFECTIVE ).