conundrum

a confusing problem that is hard to solve

पहेली, उलझन

Usage

Examples

Feeding fifty guests on ₹2,000 was a real conundrum.

Choosing between two good colleges is a conundrum.

Common mistake

Two plus two is an easy conundrum.

Two plus two is an easy sum.

A conundrum is hard and puzzling, never easy.

Remember: Conundrum: a riddle that drums in your head.