Did you know?

Click any word in a definition or example to find the entry for that word

Not known or difficult to know - thesaurus

Synonyms

secret

adjective

not known about by many people

private

adjective

understood by only a few people, not by everyone

personal

adjective

private and not known or available to most people

strange

adjective

not familiar or known to you

unknown

adjective

if something is unknown, people do not know about it or do not know what it is

uncertain

adjective

not clearly known or understood

hidden

adjective

if something is hidden, most people do not know about it or understand it

mysterious

adjective

not recognized or known

anonymous

adjective

if someone is anonymous, no one knows their name

obscure

adjective

not known about, or not well known

Show me more
Show me less

More synonyms

anonymous

adjective

used about something that is done, written etc by someone whose name is not known

behind someone’s back

if you do something bad or unkind behind someone’s back, you do it without them knowing

behind the scenes

not seen or heard by the audience of a film, play etc

chicken-and-egg

adjective

a chicken-and-egg situation is one where it is impossible to say which of two things happened first or caused the other to happen

dark

adjective

a dark secret or mystery is kept well hidden, especially because people would not approve if they knew about it

dark

adjective

a dark place is distant and mysterious because very little information is known about it

fall on deaf ears

if something such as a warning, a request, or an attempt to change someone’s attitude falls on deaf ears, it is completely ignored by the person who hears it

finely

adverb

if something such as a situation or a game is finely balanced or finely poised, it is impossible to guess how it will end

ignorance is bliss

used for saying that it is better not to know something, because then you will not worry

incalculable

adjective

something that is incalculable is not certain enough to be planned for or known about before it happens

incognito

adverb

using a false name, or changing your appearance so that you will not be recognized

inconceivable

adjective

impossible to think about or imagine

indeterminable

adjective

impossible to know or establish accurately

indeterminate

adjective

not known or clearly established

intangible

adjective

not able to be touched or measured, and difficult to describe or explain

in the background

in a place or situation in which people do not notice you

invisible

adjective

not officially recognized or fairly represented

I/you/he etc can only guess

used for emphasizing that something is not known, especially someone’s feelings or the degree to which something is happening

little does someone know/realize

used for saying that someone does not know/realize that something is true

misunderstood

adjective

if someone or something is misunderstood, people do not realize what they are really like

mystery

adjective

a mystery person or thing is someone or something that you do not know the name of or do not know anything about

nameless

adjective

a nameless person or thing has a name that you do not know

new

adjective

new information or facts are things that you did not know previously

new

adjective

if someone discovers something new, they find something that no one else knows about

there is more to someone than meets the eye

used for saying that someone has qualities or experience that someone else does not know about

there’s no knowing/saying/telling etc

it is impossible to know/say etc what is true or what will happen next

unaccounted for

adjective

if something is unaccounted for, you are unable to explain what happened to it or where it is

unacknowledged

adjective

not given the praise or admiration that is deserved

unacknowledged

adjective

ignored or not thought about in a conscious way

unbeknown to someone

without someone’s knowledge

undeclared

adjective

an undeclared activity or situation exists but has not been formally or officially announced

underground

adjective

not well known by most people and different from what is usual or popular

undisclosed

adjective

not reported publicly

undiscovered

adjective

not noticed or known about

unexplained

adjective

an unexplained event seems to have no explanation or reason

unexplored

adjective

never visited by people

unexplored

adjective

not thought about or considered before

unfamiliar

adjective

used about things that you have no knowledge or experience of

unforeseeable

adjective

impossible to know about or expect

unheard

adjective

ignored

unheeded

adjective

ignored

unheralded

adjective

mainly journalism not previously noticed or praised much

unidentifiable

adjective

impossible to recognize or name

unidentified

adjective

not recognized or known

unknowable

adjective

formal impossible to know

unknown to someone

used for saying that someone does not know something

unmarked

adjective

something that is unmarked has no words or symbols on it to show what or where it is

unrecognized

adjective

if something is unrecognized, people do not know or admit that it exists

unrecognized

adjective

used about good things that people do that no one thanks or admires them for

unrecorded

adjective

not written about or mentioned in official documents

unremarked

adjective

formal not noticed or discussed, usually because no one is interested

unseen

adjective

not seen or known about by anyone

unsolved

adjective

an unsolved problem or mystery is one that you have not dealt with or explained

unspecified

adjective

not mentioned, or not known

unsuspected

adjective

existing without your knowledge

when someone’s back is turned

when someone is not there, or is not paying attention

you don’t know/haven’t heard the half of it

used for telling someone that a situation is more shocking or complicated than they think

BuzzWord

hygge

a lifestyle focussing on simple pleasures such as comfort and cosiness in the home, and spending time with friends and family

BuzzWord Article

Open Dictionary

sofar

a form of location that involves the underwater detonation of a bomb which causes sound waves that are picked up by ships

add a word

Blog

A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play