Nonbeliever : অবিশ্বাসী; অনীশ্বরবাদী;
Related Words
non believer  nonbeliever  See Words Also In
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Certain of(নিশ্চিত): Jamal is certain of his success.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Fed up with (বিরক্ত): He is fed up with waiting for her.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.