Unchallengeable : অপরিবর্তনীয়;
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Appropriate Prepositions
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Debar from (বঞ্চিত হওয়া/বাধা দেওয়া): He is debarred from getting a job.
Greed for (লোভ): He has an indomitable greed for wealth.
Side with (পক্ষ অবলম্বন করা): The Chairman sided with the powerful party.
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Idioms
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.