Unaccountable : কারণ নির্ণয়ে অসাধ্য; অকারণ; দায়ী নহে এমন;
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unaccountable  unaccountably  uncountable  See Words Also In
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Appropriate Prepositions
Attend to(মনোযোগ দেওয়া): Please attend to my advice.
Cruise to (জয় লাভ করা): The Bangladesh team cruised to their fifth successive win this afternoon.
Look at (তাকানো): Students look at the blackboard.
Meet with (হঠাৎ কোন কিছু হওয়া): Yesterday I met with an accident.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Null and void (বাতিল): The deed has been null and void now.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.