Unsatisfactory : অসন্তোষজনক;
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Appropriate Prepositions
Bad at (অদক্ষ): He is not bad at English.
Convinced of (আশ্বস্ত): You are convinced of his product.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Indulge in (আসক্ত): You should not indulge in social media.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
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Idioms
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.