1.  not do one's best
2.  not exert oneself

• 1. 不力: Ineffective | not do one's best | not exert oneself
• 2. 不可抗力: force majeure | vis major | act of God | irresistible force
• 3. 不懈努力: Unremitting efforts | make unremitting efforts | tireless efforts | Their tireless efforts

更多释义

• 1.我们有必要创造一个健全的执法体系，因为执行不力的法律会带来犯罪和暴力。
  A sound system of law enforcement is necessary because poorly enforced laws cause crime and violence.
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• 2.坠机是导航不力的直接后果。
  The crash was a direct result of inadequate navigational aids.
  dict.yoduao.com
• 3.该市长在打击毒品的斗争中行动不力。
  The mayor had become ineffectual in the struggle to clamp down on drugs.
  dict.yoduao.com

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