unknown
B1neutral
Definition
Meaning
Not known, familiar, or identified.
Refers to things, persons, or quantities that are not recognized, understood, or discovered; often used to describe what is mysterious, unfamiliar, or not yet ascertained.
Linguistics
Semantic Notes
Can function as an adjective, noun, and less commonly as a verb (to make unknown). As a noun, it often refers to an unknown person, thing, or mathematical variable.
Dialectal Variation
British vs American Usage
Differences
No significant differences in core meaning or usage. Minor spelling preferences may exist in derived forms (e.g., 'unknown' vs 'unbeknownst', with 'unbeknownst' being chiefly British).
Connotations
Identical connotations.
Frequency
Equally frequent in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
be unknown to (someone)unknown to (someone)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “venture into the unknown”
- “a leap into the unknown”
Usage
Context Usage
Business
Refers to unquantified risks, new markets, or unidentified competitors.
Academic
Used for undiscovered phenomena, variables in equations, or historical unknowns.
Everyday
Describes unfamiliar people, places, or information.
Technical
In mathematics and science, denotes an unspecified variable or an undetermined element.
Examples
By Part of Speech
verb
British English
- The formula was carefully unknown by the scribe.
- They sought to unknown the classified documents.
American English
- The software update unknows your previous settings.
- He attempted to unknown his past.
Examples
By CEFR Level
- His name is unknown.
- I have an unknown number on my phone.
- The artist was almost unknown before the exhibition.
- They faced many unknown dangers on their journey.
- The long-term effects of the medication are as yet unknown.
- She was a relative unknown who suddenly became a star.
- Unknown to the board, the CEO had already negotiated the merger.
- The equation contains two unknown variables, x and y.
Learning
Memory Aids
Mnemonic
Think of 'UN-' (not) + 'KNOWN' (familiar) = NOT FAMILIAR.
Conceptual Metaphor
THE UNKNOWN IS A DARK PLACE / A BLANK SPACE. (e.g., 'exploring the unknown', 'a map of unknown lands').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation of 'unknown artist' as 'неизвестный артист' when 'малоизвестный артист' (little-known) is more natural.
- Do not confuse 'unknown' with 'strange' (странный).
Common Mistakes
- Using 'unknown' as a countable noun without an article (e.g., 'He is unknown' vs. 'He is an unknown').
- Confusing 'unknown' with 'unknowingly'.
Practice
Quiz
In which context is 'unknown' used as a noun?
FAQ
Frequently Asked Questions
'Unknown' simply means not known or identified. 'Anonymous' specifically implies a deliberate choice to withhold one's name or identity.
Yes, it can describe unidentified people (an unknown caller), places (an unknown island), facts (unknown information), or quantities (an unknown variable).
Yes, but the meaning differs. 'Unknown' describes a state of not being known. 'Unknowingly' is an adverb meaning 'without being aware'.
It is an adverbial phrase meaning 'without the knowledge of'. Example: 'Unknown to his parents, he had left the country.'