Spontaneous : স্বত:স্ফূর্ত, স্বেচ্ছাবৃত্ত;
Related Words
spontaneous  spontaneously  spontaneousness  See Words Also In
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Appropriate Prepositions
Anxious about (কোনো কিছুর ব্যাপারে চিন্তিত বা উদ্বিগ্ন): Karim is anxious about his father’s death. Karim is anxious for getting a job.
Appetite for(ক্ষুধা): He has no appetite for food.
Bad at (অদক্ষ): He is not bad at English.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Look for (খোঁজা): I was looking for the lost phone.
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Idioms
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
In the long run (পরিণামে): You will have to suffer in the long run.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.