All conundrum synonyms

noun conundrum

• riddle — a coarse sieve, as one for sifting sand in a foundry.
• mystery — anything that is kept secret or remains unexplained or unknown: the mysteries of nature.
• puzzlement — the state of being puzzled; perplexity.
• poser — wannabe, pretentious person
• mystification — to perplex (a person) by playing upon the person's credulity; bewilder purposely.
• problem — any question or matter involving doubt, uncertainty, or difficulty.
• why — for what? for what reason, cause, or purpose?: Why did you behave so badly?
• brain-teaser — a puzzle or problem whose solution requires great ingenuity.
• closed book — something deemed unknown or incapable of being understood
• puzzle — a toy, problem, or other contrivance designed to amuse by presenting difficulties to be solved by ingenuity or patient effort.
• challenge — A challenge is something new and difficult which requires great effort and determination.