Cryptic

ˈkrɪptɪk

adjective

having a meaning that is mysterious or obscure

The word 'cryptic' comes from the Greek word 'kryptikos', meaning 'hidden' or 'secret'. It is often used to describe something that is difficult to understand or decipher.

And there was Quaithe of the Shadow, that strange woman in the red lacquer mask with all her cryptic counsel.

George R. R. Martin

A Storm of Swords

“He's a helluva nice guy.” “Larry?” She laughed a little, a strange and somehow cryptic sound.

King, Stephen

The Stand

“You see, when you gave Professor Snape that cryptic warning, he realized that you had had a vision of Sirius trapped in the bowels of the Department of Mysteries.

J. K. Rowling

Harry Potter and the Order of the Phoenix

More likely Barris whipped out a hidden transmitter from the mess and chaos of his room--which, like all the other rooms in the house, had now for the first time come under twenty-four-hour scanning--and sent a cryptic signal to the other bunch of cryptic motherfuckers with whom he currently conspired for whatever people like him or them conspired for.

Dick, Philip K.

A Scanner Darkly

Was it a cryptic message?

Fyodor Dostoevsky

The Idiot

There was a time when, I venture to believe, I knew more about Taddeo da Poggibonsi, more about the cryptic Amico di Taddeo, even than Henry does.

Aldous Huxley

Crome Yellow

The tall, tottery walls which pressed in on them had been built from an exotic array of materials: cars which had been partially or completely flattened by the chunks of granite and steel placed on top of them; marble pillars; unknown factory machines which were dull red with rust wherever they weren't still black with grease; a chrome-and-crystal fish as big as a private plane with one cryptic word of the High Speech—DELIGHT—carefully incised into its scaly gleaming side; crisscrossing chains, each link as big as Jake's head, wrapped around mad jumbles of furniture that appeared to balance above them as precariously as circus elephants do on their tiny steel platforms.

Stephen King

The Waste Lands (The Dark Tower, Book 3)

There were no miracles; prayers went unanswered, and misfortune tramped with equal brutality on the virtuous and the corrupt; and the chaplain, who had conscience and character, would have yielded to reason and relinquished his belief in the God of his fathers—would truly have resigned both his calling and his commission and taken his chances as a private in the infantry or field artillery, or even, perhaps, as a corporal in the paratroopers—had it not been for such successive mystic phenomena as the naked man in the tree at that poor sergeant’s funeral weeks before and the cryptic, haunting, encouraging promise of the prophet Flume in the forest only that afternoon: ‘Tell them I’ll be back when winter comes.’

Heller, Joseph

Catch-22