Perfidiousness : অবিশ্বস্ততা;
Related Words
perfidiousness  propitiousness  See Words Also In
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Die of (রোগে মরা): Many people died of cholera.
Run over (চাপা পড়া): The man was run over by a truck.
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Idioms
Art and part (অভিসন্ধি ও সম্পাদন) We have no art and part in his affairs.
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.