The meaning of UNKNOWN is not known or not well-known; also : having an unknown value. How to use unknown in a sentence.

Unknown is a 2011 action thriller film directed by Jaume Collet-Serra and starring Liam Neeson, Diane Kruger, January Jones, Aidan Quinn, Bruno Ganz, and Frank Langella. [7]

Unknown definition: not known; not within the range of one's knowledge, experience, or understanding; strange; unfamiliar.. See examples of UNKNOWN used in a sentence.

UNKNOWN definition: 1. not known or familiar: 2. what is not familiar or known: 3. a person, especially a performer…. Learn more.

Feb 18, 2011 · A man (Liam Neeson) is in a horrible accident, and when he recovers, no one knows who he is, including his wife, in "Unknown," a 2011 film starring Liam Neeson, January …

1. not known; not within the range of knowledge, experience, or understanding; strange; unfamiliar. 2. not discovered, explored, identified, or ascertained. 3. not widely known; not …

If you say that a particular problem or situation is unknown, you mean that it never occurs. Heart disease was virtually unknown at the turn of the century.

That which is unknown; anything or everything which is outside the scope of existing knowledge or experience; that which is beyond the limits of human comprehension or understanding.

Oct 16, 2025 · unknown (plural unknowns) (algebra) A variable (usually x, y or z) whose value is to be found. Any thing, place, or situation about which nothing is known; an unknown fact or …

Find 569 different ways to say UNKNOWN, along with antonyms, related words, and example sentences at Thesaurus.com.