The phrase "sticking at" refers to persistently and diligently working towards a goal or task despite challenges or setbacks. A few synonyms for this phrase include persevering, persisting, perseverating, continuing, and staying the course. Other related terms include grit, determination, tenacity, and resilience. These words all describe qualities of someone who is willing to put in the hard work and effort necessary to achieve their objectives and overcome obstacles. They are valuable traits to cultivate in order to succeed and thrive in both personal and professional pursuits.