Hardheaded : নির্মম; নিষ্ঠুর; চতুর; ভাবপ্রবণতাহীন;
Related Words
haired  hard-headed  hardheaded  hardihood  herded  hoarded  See Words Also In
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Bar to(বাধা): Poverty is not a bar to happiness.
Greed for (লোভ): He has an indomitable greed for wealth.
Regret for (দুঃখ করা): We regretted for his failure.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Three score (ষাট): He is happy as his brother got three score.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.