English translation of 'अथक'
1. tireless adjective
If you describe someone or their efforts as tireless, you approve of the fact that they put a lot of hard work into something, and refuse to give up.
2. unrelenting adjective
If you describe someone's behaviour as unrelenting, you mean that they are continuing to do something in a very determined way.
He showed unrelenting commitment to the team.
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Translation of अथक from the Collins Hindi to English Dictionary