Dictionary.com
Thesaurus.com

good question

British  

noun

  1. a question that is hard to answer immediately

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"We don't start dancing in the streets over what seems to be a good question," said plaintiff's attorney Mark Lanier.

From Barron's

Why, is another good question.

From BBC

Fanning: That’s such a good question.

From Los Angeles Times

“It is a good question, but the better question is, do you have one?”

From Literature

That is a good question, and I don’t have a good answer.

From Slate