Unhappy : অসুখী, বিষন্ন, হতভাগ্য, অখুশী;
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Appropriate Prepositions
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
Damage to (ক্ষতি): The flood caused much damage to crops last year.
Devoted to (মনোযোগী): He is devoted to music.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
In vogue (চালু): This custom is not in vogue at present.
Slow coach (অলস): You cannot expect much from a slow coach.