Perfidiousness : অবিশ্বস্ততা;
Related Words
perfidiousness  propitiousness  See Words Also In
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Appropriate Prepositions
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Convinced of (আশ্বস্ত): You are convinced of his product.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Substitute for (বদলে দেওয়া): This action is substitute for that.
Wish for (প্রত্যাশা করা): Everybody wish for happiness.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.