Clear-headed : বিচক্ষণ;
Related Words
clear the air  clear-eyed  clear-headed  cleared  clearheaded  See Words Also In
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Appropriate Prepositions
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
Infested with (অতিষ্ঠ): The room is infested with rats.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Run into (জড়িয়ে পড়া): He had run into debt.
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Idioms
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.