Costless : মূল্যহীন;
Related Words
casteless  castles  costless  costliest  cutlass  See Words Also In
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Appropriate Prepositions
Admit to(ভর্তি করা): The boy was admitted to class Nine.
Agree with(ব্যক্তির সাথে একমত হওয়া): I agree with you.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Noted for (বিখ্যাত): She is noted for dancing.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.