Invalidity : দুর্বলতা; অকার্যকরতা;
Related Words
immovability  in validity  inability  invalid  invalidate  invalidated  invalidating  invalidism  invalidity  See Words Also In
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Appropriate Prepositions
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Desire for (কামনা): He has no desire for fame.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Null and void (বাতিল): The deed has been null and void now.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.