Unflappable : উদ্বেগহীন; অচঞ্চল; সংকটে অবিচলিত; অনুদ্বিগ্ন;
Related Words
unappealable  unavailable  unbelievable  unflappable  See Words Also In
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Appropriate Prepositions
Deal with (কারো সাথে ব্যবহার বা আচরণ করা): Shahid can deal well with the customers.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
Solution to (সমাধান): None can solution to every problem.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Of course (অবশ্যই): Of course, you know what that meant.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.