Unworried : নিশ্চিন্ত; অশঙ্কিত; অচঁচল; নিরূদ্বেগ; অব্যাকুল;
Related Words
un married  unhonoured  unhurried  unhurriedly  unhurriedness  unmarried  unmarried girl  unmerited  unmoored  unread  unready  unrewarded  unwearied  unworried  unworthiest  unwritten  See Words Also In
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Appropriate Prepositions
Answer for(কোনো কারনে জবাবদিহি করা): He will have to answer for his misdeeds.
Certain of(নিশ্চিত): Jamal is certain of his success.
Contribution to (অবদান): His invention made a major contribution to road safety.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
All along - (সব সময়): I was present in the meeting all along.
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Safe and sound (নিরাপদে)— He reached home safe and sound.