A difficult problem or situation not easily resolved.
My father-in-law perhaps introduced this word to me years ago.
He was an interesting man.
Completely self-educated after high school, his passion was reading and we enjoyed a very special 15 year friendship until his death from a heart attack in the parking lot of a Nevada casino.
So, Norman, this word is for you.
What is the picture in your mind when you see this word?
I see a question mark.
Do you have a question for me?