Hard-heartedness : নির্দয়তা; নির্মমতা;
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Appropriate Prepositions
Attentive to(মনোযোগী): He is attentive to his business.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Careless of(অসতর্ক): Do not be careless of your health.
Identical with (একই ধরণের): You are identical with your sister.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Far and wide (সর্বত্র): His fame spread far and wide.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
Lump sum (এক কালীন) — He gave us lump sum money.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.