"Tough questions" refers to difficult or challenging inquiries that require careful thought or consideration to answer. They usually ask for more detailed or complicated information, making them harder to respond to. Full definition
Parent Talk Workshop These workshops are for parents of preschool children and are designed to promote positive parent - child communication when children begin to ask tough questions about sex, sexuality and reproduction. (plannedparenthood.org)
As I mentioned above, It is often during young adulthood that people begin to think for themselves and ask tough questions about their faith. (rachelheldevans.com)
I think that the moderator in the next debate will try harder to hold both sides up to the same standard of behavior and ask tough questions of both sides. (firstthings.com)