Useless : অনাবশ্যক; অপ্রয়োজনীয়;
Related Words
use less  useless  useless person  uselessly  uselessness  See Words Also In
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Appropriate Prepositions
Entitled to (অধিকারী): He is entitled to a reward for honesty.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Hope for (আশা করা): Let us hope for the best.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.