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:

Book -- The One Best Way: Frederick Winslow Taylor and the Enigma of Efficiency , by Robert Kanigel;
Why the letters are reversed is a puzzling enigma.
Seagal is an enigma.
Tryptophan catabolism by cells expressing IDO is something of an enigma and has resulted in speculation as to why the body requires two enzymes with different tissue specificities to degrade the rarest essential amino acid [ 5, 34].