Which option best captures the sense of profound as used here?

• A. very deep
• B. (of a state, quality, or emotion) very great
• C. (of a disease or disability) very severe
• D. (of a subject or idea) intellectually deep; entering far into subjects

Answer: (D)

Profound here points to intellectual depth and thorough exploration of a subject or idea. It’s about thinking that goes beyond the surface, revealing deep insight or extensive analysis. That makes the sense describing a subject or idea as intellectually deep and entering far into its details the best fit. The other senses refer to physical depth, broad intensity, or medical severity, which don’t match the idea of deep, rigorous thinking about a topic. So the chosen sense captures the notion of substantial, thoughtful engagement with the subject.