The correct answer is 'finite.' Key Points - Let us see the meaning of boundless: - Boundless: unlimited, infinite or immense. - Example: We were filled with boundless joy. - Let us see the meanings of the given options: - High:great, or greater than normal, in quantity, size, or intensity. - Vast: of very great extent or quantity; immense. - Expansive: covering a wide area in terms of space or scope; extensive. - Finite: limited in size or extent. - From the meanings of the given words, we can say that the word 'finite' is the oppositeof the meaning of the underlined word 'boundless'. - Hence, the correct answer is 'finite.'