Unfailingly : অপর্যাপ্তরূপে; অবিচলিতরূপে;
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unfailingly  unfeelingly  See Words Also In
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Fed up with (বিরক্ত): He is fed up with waiting for her.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.