Impregnability : অগম্যতা;
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impregnability  impressionability  See Words Also In
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Appropriate Prepositions
Careless of(অসতর্ক): Do not be careless of your health.
Convert to(দীক্ষিত): Tom is converted to another religion.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.