Efficacy : ফলপ্রসূতা; কার্যক্ষমতা; নিশ্চিত ফলদানের ক্ষমতা;
Related Words
efface  efficacious  efficacy  effigy  See Words Also In
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Appropriate Prepositions
Concerned with(জড়িত): She was concerned with such things.
Convinced of (আশ্বস্ত): You are convinced of his product.
Identical with (একই ধরণের): You are identical with your sister.
Infested with (অতিষ্ঠ): The room is infested with rats.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
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.
Worthy of (যোগ্য) - He is worthy of a good job.