assiduous
Definition
Exhibiting careful and persistent effort, attention, or work, usually over a long period of time.
हिन्दी धैर्य और निरंतर प्रयास, ध्यान या कार्य का प्रदर्शन करना, आमतौर पर लंबे समय तक
Example
"The assiduous student studied diligently throughout the semester."