Conscienceless : বিবেকহীন;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Careless of(অসতর্ক): Do not be careless of your health.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.