Incomprehensibility : দুর্বোধ্যতা; অবোধগম্যতা; অচিন্তনীয়তা;
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Anxious about (কোনো কিছুর ব্যাপারে চিন্তিত বা উদ্বিগ্ন): Karim is anxious about his father’s death. Karim is anxious for getting a job.
Conceal from(লুকানো) Do not conceal anything from me.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Relation with (সম্পর্ক): I have no relation with the culprit.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
At a discount (অনাদৃত) Female education is no longer at a discount now.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.