Clear-headed : বিচক্ষণ;
Related Words
clear the air  clear-eyed  clear-headed  cleared  clearheaded  See Words Also In
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Appropriate Prepositions
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Conscious of(সচেতন): I am conscious of my deficiencies.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Innocent of (নির্দোষ): The maid servant was proved innocent of the alleged theft.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.