She noticed an unseen figure standing at the end of the hallway.

Tomorrow's unseen will cover two chapters from the textbook, so make sure you revise thoroughly.

After hours of trying, he finally had unseen the disturbing scene in his mind, though it still haunted him.

After the estate sale, the curator found a dusty crate full of unseens that shed new light on the artist's early career.

She bought a sight unseen painting because she admired the artist's work.

He bought the unsight unseen painting based solely on the dealer's recommendation.

The tour guide muttered the proverb 'what has been seen cannot be unseen' after the visitors stumbled upon the abandoned asylum.

He warned me—that which has been seen cannot be unseen—and now I can't stop thinking about it.