American English

Definition of tireless adjective from the Oxford Advanced American Dictionary



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  1. 1putting a lot of hard work and energy into something over a long period of time synonym indefatigable
  2. 2 a tireless campaigner for human rights to have tireless energy She was tireless in her efforts on our behalf.
adverb He has worked tirelessly for peace.
See the Oxford Advanced Learner's Dictionary entry: tireless