enigma

He seems to have been an enigma even to those who knew him best, but there was no mystery about his penchant for tight control of the band.

"We live in an electrical world, electricity is all around us, but the electrostatics of small organisms remains mostly an enigma," Ortega-Jiménez says.

News accounts of the time portrayed Moore as an enigma.

But in the franchise’s ongoing parable of mankind’s hubris, the all-seeing enigma in “Alien: Earth” adds another reason to make us shudder.

The message is disturbing, intimating that the two men were very close, had a lot in common and shared “a wonderful secret” about how “enigmas never age.”