Unfathomable : অতলস্পর্শ, অগাধ, দুবোর্ধ্য;
Related Words
un fathomable  unfathomable  unputdownable  See Words Also In
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Appropriate Prepositions
Admit of(স্থান করা, সুযোগপ্রাপ্ত হওয়া): His offence admits of no explanation.
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Consistent with(সামঞ্জস্যপূর্ণ): Your action is not consistent with your word.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
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Idioms
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.