Words similar to enigma

Example sentences for: enigma

How can you use “enigma” in a sentence? Here are some example sentences to help you improve your vocabulary:

So is director and co-writer Robert Towne ( Personal Best, Chinatown ), who "holds the enigma of Prefontaine's self-propulsion up to the light, turns it this way and that, and then wisely leaves us more or less in the dark" (Daphne Merkin, The New Yorker ). (Explore this collection of photos of the real Prefontaine.)
What would drive someone to do this is still an enigma to me.
But the disease remains an enigma to many, and it often goes undiagnosed, even in endemic areas.
Book -- The One Best Way: Frederick Winslow Taylor and the Enigma of Efficiency , by Robert Kanigel;
--is a further enigma.