Insubstantial : অবাস্তব; অসার; অলীক; অস্থূল;
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Play at (খেলা): I do not play at cards.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Pick a quarrel (ঝগড়া করা)—Do not pick a quarrel.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.