Unfathomable : অতলস্পর্শ, অগাধ, দুবোর্ধ্য;
Related Words
un fathomable  unfathomable  unputdownable  See Words Also In
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Appropriate Prepositions
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Due to (কারণে): His absence is due to illness.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.