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:

What Henry David possesses remains an enigma.
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.)
If susceptible teenagers watched that program, perhaps they will be inspired to work on Linear A, still an enigma, owing largely to the paucity of corpus.
Book -- The One Best Way: Frederick Winslow Taylor and the Enigma of Efficiency , by Robert Kanigel;