Conscienceless : বিবেকহীন;
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Appropriate Prepositions
Contemporary of (সমসাময়িক): William Wordsworth was a contemporary for greater efficiency.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Bird’s eye view - (ভাসা ভাসা দৃশ্য, হালকাভাবে দর্শন): We took a bird’s eye view of the scenery.
Run short (কমতি পড়া) —I ran short of money.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.