Simple But Intelligent Word Choices, Vol. 2
a confusing, intricate, or difficult problem
Words It Might Replace:
problem; challenge; dilemma
"I thought you were trying to solve the conundrum of how, in spite of our expensive automatic sprinkling system, we still have brown patches in the yard." Joe and Linda Skinner, Grand Junction Free Press, July 8, 2011
Want more? Here's another list of Simple But Intelligent Word Choices.