Optimists : আশাবাদী; আশাবাদী ব্যক্তি; আশাবাদী দার্শনিক; মঙ্গলবাদী;
Related Words
optimistic  optimistically  optimists  See Words Also In
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Adjacent to(সংলগ্ন): The Post Office is adjacent to my house.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Concerned with(জড়িত): She was concerned with such things.
Dressed in (সজ্জিত, পরিহিত): The girl was dressed in silk.
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Idioms
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.