Costless : মূল্যহীন;
Related Words
casteless  castles  costless  costliest  cutlass  See Words Also In
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Appropriate Prepositions
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Compensate for(ক্ষতিপূরণ করা): I will compensate him for the loss.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Short temper (রগচটা)— He is a man of short temper.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.