dogged - determined
The word ‘dogged’ implies unwavering persistence and tenacity in the pursuit of something, with its meaning being derived from the tenaciousness shown by a dog in search of a bone. This quality of not giving up is seen as being highly admirable and can be a good indicator of success in both a social and professional context.
It took months of dogged research and investigating, but the official report on the incident is now ready for release.
We had to work doggedly to get the order completed before the deadline, but in the end, our industry and determination paid off.
The doggedness with which you pursued your goal is highly commendable. You kept fighting despite multiple setbacks.