The synonym of 'Assiduous' is-

[লাইভ পরীক্ষার প্রশ্নে 'Antonym' স্থলে ভুলক্রমে 'Synonym' চলে আসায় প্রশ্নটি বাতিল করা হলো।]Assiduous (adjective):Bangla Meaning: অধ্যবসায়ী; প্রযত্নবান; নিষ্ঠাবান।English Meaning: Showing hard work, care, and attention to detail.Synonyms: Diligent, Careful, Hard-working, Industrious, Sedulous.Antonyms: Idle, Inactive, Unemployed, Unoccupied, Lethargic.Other Forms: Assiduously (adverb).Example Sentence: 1. He has always been an assiduous listener to radio.2. They were assiduous in their search for all the latest facts and figures.Source: Website Lecture.