Relentless : নিষ্করুণ; নির্দয়; নিষ্ঠুর; মার্জনাহীন; অবিরাম; নিরন্তর; কঠোর;
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Appropriate to(যোগ্য): His answer is appropriate to the question.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Soft Soap (নিজ অভিপ্রায়ে/অভিসন্ধিতে তোষামোদ করা): He was expert in soft soap.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.