Clear-headed : বিচক্ষণ;
Related Words
clear the air  clear-eyed  clear-headed  cleared  clearheaded  See Words Also In
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Deaf to, of, in (না শোনা, বধির হওয়া): The boy is deaf to his father’s advice. This man is deaf of/in one ear.
Play at (খেলা): I do not play at cards.
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Idioms
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
On the wane (হ্রাসমান): His fame is on the wane now.
Set free (মুক্ত করা): The prisoners were set free.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.