That's quite a conundrum.

Meaning

That's a very puzzling or difficult problem.

Examples

• John: 'How can we reconcile these two conflicting reports?'<br>
• Alice: 'That's quite a conundrum; we'll need to investigate further.'
• John: 'That's quite a conundrum; weigh the pros and cons carefully.'
• Alice: 'I can't decide whether to accept the job offer or not.'<br>