indefatigable [ˌɪndɪˈfætɪɡəbəl]

例句:

• He was indefatigable in his efforts to secure funding for new projects.
  他不知疲倦地努力为新项目寻求资金。
  来自柯林斯例句
• an indefatigable defender of human rights
  不屈不挠的人权捍卫者
  
• His indefatigable spirit helped him to cope with his illness.
  他不屈不挠的精神帮助他对抗病魔。
  
• His indefatigable optimism carried him through periods of frustration.
  来自NEWYORKER
• The daytime noisemakers are indefatigable in calling for a mate.
  来自SA
• His indefatigable efforts to secure the guardianship.
  来自P. Gay