Unnatural : অস্বাভাবিক, কৃত্রিম;
Related Words
unnatural  unnatural death  unnaturally  untruly  See Words Also In
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Appropriate Prepositions
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.