Insubstantial : অবাস্তব; অসার; অলীক; অস্থূল;
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Appropriate Prepositions
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Run after (পশ্চাদানুসরণ করা): Do not run after money.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Pick a quarrel (ঝগড়া করা)—Do not pick a quarrel.