Authenticity : সত্যতা; প্রামাণ্য; বিশ্বাসযোগ্যতা; অকৃত্রিমতা; প্রামাণিকতা; নির্ভেজালত্ব;
Related Words
authentic text  authenticate  authenticated  authenticates  authenticating  authenticity  See Words Also In
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Appropriate Prepositions
Ask about (কাউকে খোঁজ করা): Rahim asked about Karim.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Call in question (সন্দেহ করা): No one can call his honesty in question.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.