How can questions that demonstrate great understanding of a topic (rather than ignorance) be described?
As in, the question is extremely deep, or the question raises some fundamental implications, etc., and it is likely that even experts would need to do some good thinking to answer the question.
He asked several _____ questions
I would like something a bit more specific than generic synonyms-of-intelligent words like
- intelligent
- knowledgeable
- astute
etc. because I really want to capture the perhaps-subtle meaning that the question demonstrates that the speaker themselves is well-read about the topic, rather than that the speaker/question is smart. Although of course, if any words like these are commonly/idiomatically applied in this specific scenario, then they'd be great answers too.