Definition of Unknown

something that is still a mystery or uncertain

Examples of Unknown in a sentence

An unknown substance was found on the bottom of the scientist’s fossil discovery.  🔊

The name of the victim is unknown since he had no driver’s license on him at the time of his death.  🔊

An unknown creature has washed up on the shore and scared several of the villagers.  🔊

The cause of the plague used to be unknown, but now science has proven that it was carried by fleas on rats.  🔊

For a month now, an unknown superhero has mysteriously swooped through the city streets saving people from danger.  🔊

Other words in the Mysterious & Unknown category:

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