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Definitions

unknown

[uhn-nohn] / ʌnˈnoʊn /
ADJECTIVE
obscure, mysterious
Synonyms
STRONGEST
anonymous exotic foreign nameless new remote strange uncharted undiscovered unexplained unexplored unfamiliar unidentified unnamed unrecognized
STRONG
X alien dark far secret
WEAK
concealed desolate distant far-off faraway hidden humble incog incognito little-known such and such unapprehended unascertained uncelebrated undistinguished unheard-of unnoted unperceived unrenowned unrevealed unsung untold
Antonyms
STRONGEST
common familiar identified known named native normal regular relevant usual

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

An attorney for Rep. Eric Swalwell, a leading Democratic candidate for California governor, on Thursday sent a cease and desist letter to an unknown individual demanding that they stop accusing the congressman of sexual assault.

From Los Angeles Times • Apr. 10, 2026

"The immediate consequences will be a surge in vulnerability discovery, a true tsunami" of exploiting known and unknown vulnerabilities.

From Barron's • Apr. 10, 2026

Despite decades of research, its true nature remains unknown.

From Science Daily • Apr. 10, 2026

He has enormous personal tolerance for dramatic, high-stakes situations in which outcomes are unknown and won’t immediately be known.

From The Wall Street Journal • Apr. 9, 2026

How a squirrel ended up smack dab in the middle of the dance floor was unknown.

From "The Hidden Gallery" by Maryrose Wood

Vocabulary lists containing unknown

Operations and Algebraic Thinking

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