The phrase "stick at" typically refers to demonstrating perseverance or determination in pursuing a task or goal. Some synonyms for this phrase include "persist," "persevere," "keep at it," "stick with," "continue," "hang in there," "endure," and "never give up." These synonyms emphasize the importance of staying committed to a task or goal despite obstacles or setbacks. As a result, individuals who stick at something are often seen as resilient and capable of achieving success. Using these synonyms can add variety to your writing and help convey a sense of determination and resolve.