enigma — Defs

01 n. A dark, obscure, or inexplicable saying; a riddle; a statement, the hidden meaning of which is to be discovered or guessed.

pl. enigmas ((ē̇*nĭg"mȧz))

1.
A dark, obscure, or inexplicable saying; a riddle; a statement, the hidden meaning of which is to be discovered or guessed.
“A custom was among the ancients of proposing an enigma at festivals.” — Pope.
2.
An action, mode of action, or thing, which cannot be satisfactorily explained; a puzzle; as, his conduct is an enigma.