"made tireless efforts" is grammatically correct and can be used in written English
It is often used to describe someone who has put in a lot of hard work and determination towards a goal or task. Example: Despite the challenges they faced, the team made tireless efforts to complete the project on time.
Removal of heavy metals in water is a problem of Global concern and researchers all over the world are making tireless efforts to address this big issue with the best of their abilities and capabilities.
While we make tireless efforts to further strengthen the basic rights and freedoms within the framework of democratic principles and the rule of law, there can't be any stepping back.
"There is a pressing need" for them to resume, he said, adding that the US was making a "tireless effort" to make it happen.
Becky's tireless efforts have made Trap-Neuter-Return the accepted humane method of managing outdoor cats in our country.
Acknowledgment should be made of her enthusiasm and tireless efforts to create something of great beauty in the gardens of the Palace.
Through his tireless efforts, Jim made life better for millions of children and youth, and we honor his memory.
This was only made possible because of the tireless efforts of our coalition partners and signature gatherers in Ohio who spent so much time volunteering in the streets over the past several months.
HuffPost would like to give a special thanks to Hopenhagen.org, Ogilvy, and Freya Williams for their tireless efforts in making the contest a success.
It would be churlish when considering such a long book to make too much of the "tireless efforts" of one member of the team on behalf of the Everest project, or the description of another member as "tireless".
The simple but engaging story about a boy who wants a puppy for Christmas, and the puppy's tireless efforts to make it happen, navigates a sure path between mawkish and sarcastic; it invokes holiday classics like the Frosty and Rudolph cartoons while feeling completely up to date.
