Insubstantial : অবাস্তব; অসার; অলীক; অস্থূল;
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Bare of(অনাবৃত, স্বল্প-সজ্জা): The trees of the forest are bare of leaves.
Dwell in (বাস করা): He dwells in a tall apartment.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Far and wide (সর্বত্র): His fame spread far and wide.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.