How about a conundrum? Or an enigma.
"I cannot forecast to you the action of Russia. It is a riddle, wrapped in a mystery, inside an enigma; but perhaps there is a key. That key is Russian national interest." by Winston Churchill in a 1939 broadcast.
An enigma is a puzzle, or a situation that is perplexing, inexplicable, or ambiguous. Synonyms can be puzzle, riddle, mystery, question, or conundrum.
Synonyms for a mystery are enigma, secret, puzzle, conundrum, riddle, or unknown.For a mystery novel, it could be a whodunit, suspense story, or thriller.
Enigma is a complex riddle or puzzle.
Enigma most nearly means puzzle or riddle.
Russia
"I cannot forecast to you the action of Russia. It is a riddle, wrapped in a mystery, inside an enigma; but perhaps there is a key. That key is Russian national interest." by Winston Churchill in a 1939 broadcast.
It's a riddle inside an enigma wrapped in a mystery. It's a conundrum, a head scratcher, a poser. It could be concealed, encoded, cabalistic. It's unintelligible, Greek to me, written in runes
Conundrum, enigma, riddle, mystery, problem...
enigma
Enigma
An enigma is a puzzle, or a situation that is perplexing, inexplicable, or ambiguous. Synonyms can be puzzle, riddle, mystery, question, or conundrum.
Synonyms for a mystery are enigma, secret, puzzle, conundrum, riddle, or unknown.For a mystery novel, it could be a whodunit, suspense story, or thriller.
Enigma is a complex riddle or puzzle.
The noun mystery is a singular, common, abstract noun; a word for something that is difficult or impossible to understand or explain; an enigma, a riddle, a puzzle; a word for a thing.
riddle
Enigma most nearly means puzzle or riddle.