Black-hearted : ক্রুরহৃদয়; ক্রূরমতি; ক্রূর;
Related Words
black-hearted  blackguard  See Words Also In
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Appropriate Prepositions
Competent for(যোগ্য): He is not competent for the post.
Fed up with (বিরক্ত): He is fed up with waiting for her.
Refer to (সিদ্ধান্তের জন্য প্রেরণ করা): The matter was referred to the Chairman for a decision.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.