Perfidiousness : অবিশ্বস্ততা;
Related Words
perfidiousness  propitiousness  See Words Also In
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Appropriate Prepositions
Defend against (রক্ষা করা): We will defend our country against all enemies.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Penalty for, with (দণ্ড, জরিমানা): She has paid the penalty for the misuse of power with two years in prison.
Run after (পশ্চাদানুসরণ করা): Do not run after money.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.