Unproductive : অফলপ্রসূ; নিষ্ফলা;
Related Words
unpredictable  unproductive  See Words Also In
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Appropriate Prepositions
Aware of(অবগত): I am not aware of his dishonesty.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Object to (প্রতিবাদ করা): Many people objected to the remarks of the leader.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Out of order (বিকল): The elevator was out of order.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.