unremitting

US /ˌʌn.rɪˈmɪt̬.ɪŋ/
UK /ˌʌn.rɪˈmɪt̬.ɪŋ/
1.

không ngừng nghỉ

never stopping, becoming weaker, or failing:

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Our thanks are due to Bob Lawrence whose unremitting hard work has ensured the success of the whole project.