To determine the meaning of the underlined word "utopian" in the given sentence, we need to consider the context in which it is used. The sentence is: "Rajiv's utopian idea was entertaining, but not acceptable." Here, the word "utopian" is used to describe Rajiv's idea.
The word "utopian" is derived from "utopia," a term coined by Sir Thomas More in his book "Utopia," which describes an imaginary island with a perfect social, political, and legal system. In general usage, "utopian" is often used to describe something that is idealized or perfect but impractical and not realistic in the real world. Therefore, it is often synonymous with "imaginary" or "idealistic."
Analyzing the options given:
Based on the meanings of the options, the correct answer is "imaginary idea," as it best aligns with the meaning of "utopian" as something that is idealized and not feasible in practice.
Thus, the correct answer to the question is:
Correct Answer: Imaginary Idea

Pick the appropriate meaning of the term 'proscribe' used in the following sentence :-'Arms culture should be proscribed by the government.'