Black-hearted : ক্রুরহৃদয়; ক্রূরমতি; ক্রূর;
Related Words
black-hearted  blackguard  See Words Also In
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Appropriate Prepositions
Answer for(কোনো কারনে জবাবদিহি করা): He will have to answer for his misdeeds.
Appetite for(ক্ষুধা): He has no appetite for food.
Ascend from (উপরে ওঠা): Rahim watched the mist ascending from the valley.
Consolidate for (শক্তিশালী করা): The four new companies consolidated for greater efficiency.
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
In vogue (চালু): This custom is not in vogue at present.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.