inefficacious

Từ điển Oxford Learners Wordfinder Dictionary

adjective

lacking the power to produce a desired effect
- laws that are inefficacious in stopping crime
• Ant:
efficacious
• See Also:
ineffective, uneffective, ineffectual
• Derivationally related forms:
inefficaciousness
• Attrubites:
efficacy, efficaciousness