Invalidate : বাতিল করা; অসিদ্ধ করা; ব্যর্থ করা;
Related Words
in validity  inabilities  inability  inflate  inflated  inflates  invalid  invalidate  invalidated  invalidating  invalidism  invalidity  inviolate  involute  involuted  See Words Also In
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Appropriate Prepositions
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Contemporary of (সমসাময়িক): William Wordsworth was a contemporary for greater efficiency.
Free from (মুক্ত): He is now free from danger.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.