Indubitable : সুনিশ্চিত; প্রশ্নাতীত; সংশয়াতীত; সন্দেহাতীত; নিশ্চিত;
Related Words
indubitable  indubitably  See Words Also In
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Appropriate Prepositions
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Complain about (কোনো বিষয়ে নালিশ করা): They complained about the mismanagement of the programme.
Fantasize about (কল্পনা করা): They fantasized about winning the lottery.
Play on (বাজানো): They play on the piano.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Of course (অবশ্যই): Of course, you know what that meant.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.