When it comes to describing someone who is incredibly diligent and committed, several synonyms can be used instead of the phrase "most hardworking". One such synonym is "industrious", which implies a person's inclination towards constant effort and productivity. Another option is "diligent", which emphasizes someone's persistent dedication and thoroughness in all tasks. "Enterprising" is another apt synonym, focusing on an individual's resourcefulness and initiative when faced with challenges. "Prolific" portrays someone who consistently produces a high quantity and quality of work. Lastly, "assiduous" captures the notion of tireless and careful attention to every detail. All of these alternatives aptly capture the essence of a hardworking individual in various contexts.