Institution: জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় (JKKNIU) Exam: ক ইউনিট || জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় || 2012
Topic: Antonyms, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The term "economical" refers to being efficient in the use of resources, especially money, implying a careful and prudent approach to spending. When considering antonyms, we look for concepts that represent the opposite characteristics. In this context, "extravagant" stands out as the correct antonym of "economical."

"Extravagant" describes a tendency to spend lavishly or excessively, often beyond what is necessary or reasonable. This behavior contrasts sharply with the idea of being economical, where the focus is on minimizing waste and making the most out of available resources. The other options—financial, frugal, and miserly—do not serve as direct opposites to economical.

- "Financial" pertains to matters of finance and does not inherently indicate either wise or wasteful spending.
- "Frugal" indicates a similar, but even more careful approach than economical, emphasizing the avoidance of unnecessary expenditure.
- "Miserly" refers to extreme reluctance to spend, which is not the opposite but rather a different mentality about resource allocation.

Thus, "extravagant" accurately captures excessive spending, making it the true antonym of "economical."