Doubtfully : অনিশ্চিতভাবে;
Related Words
doubtful  doubtfully  doubtfulness  See Words Also In
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Appropriate Prepositions
Damage to (ক্ষতি): The flood caused much damage to crops last year.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Indulge in (আসক্ত): You should not indulge in social media.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
On the wane (হ্রাসমান): His fame is on the wane now.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?