What is the term used to describe someone who is dedicated and hardworking?

The term that best describes someone who is dedicated and hardworking is "diligent." This word conveys a strong sense of carefulness and thoroughness in work or duty, highlighting the effort and commitment an individual puts into their tasks. A diligent person consistently applies themselves and pays attention to detail, often going above and beyond what is required to achieve their goals.

While the other terms share some similarities and can also describe hard work, they carry slightly different connotations. "Persistent" implies a determination to continue despite difficulties, which focuses more on the continuation of effort rather than the quality or attentiveness of work. "Industrious" suggests a person who is actively engaged in productive activities, emphasizing activity over the meticulousness of the work. "Assiduous" similarly highlights careful and constant effort but is less commonly used in everyday language compared to "diligent."

Overall, "diligent" encapsulates the idea of dedicated and hardworking behavior in a way that is both widely recognized and understood.