Synonyms: unknown, unknown quantity
Definition: a variable whose values are solutions of an equation
Similar words: variable
Definition: a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity
Synonyms: terra incognita, unknown, unknown region
Definition: an unknown and unexplored region
Usage: they came like angels out the unknown
Similar words: region
Definition: a large indefinite location on the surface of the Earth
Usage: penguins inhabit the polar regions
Synonyms: stranger, unknown, alien
Definition: anyone who does not belong in the environment in which they are found
Similar words: intruder, interloper, trespasser
Definition: someone who intrudes on the privacy or property of another without permission
Synonyms: unidentified, unknown, unnamed, nameless
Definition: being or having an unknown or unnamed source
Usage: a poem by an unknown author; corporations responsible to nameless owners; an unnamed donor
Similar words: anon., anonymous
Definition: having no known name or identity or known source
Usage: anonymous authors; anonymous donors; an anonymous gift
Definition: not known before
Usage: used many strange words; saw many strange faces in the crowd; don't let anyone unknown into the house
Similar words: unfamiliar
Definition: not known or well known
Usage: a name unfamiliar to most; be alert at night especially in unfamiliar surroundings
Synonyms: unsung, unknown, obscure
Definition: not famous or acclaimed
Usage: an obscure family; unsung heroes of the war
Similar words: inglorious
Definition: not bringing honor and glory
Usage: some mute inglorious Milton here may rest
Synonyms: unknown
Definition: not known
Usage: an unknown amount; an unknown island; an unknown writer; an unknown source
Similar words: uncharted, unmapped, chartless
Definition: (of unknown regions) not yet surveyed or investigated
Usage: uncharted seas
Similar words: little-known
Definition: unknown to most people
Similar words: unbeknown, unbeknownst
Definition: (usually used with `to') occurring or existing without the knowledge of
Usage: a crisis unbeknown to me; she had been ill for months, unbeknownst to the family
Similar words: undiagnosed
Definition: eluding diagnosis
Usage: undiagnosed disease
Similar words: undiscovered, unexplored
Definition: not yet discovered
Usage: undiscovered islands
Similar words: unheard-of
Definition: previously unknown
Usage: a first novel by an unheard of writer; developments on an unheard-of scale
Similar words: unidentified
Definition: not yet identified
Usage: an unidentified species; an unidentified witness
Synonyms: unknown
Definition: not known to exist
Usage: things obscurely felt surged up from unknown depths
Similar words: unsuspected
Definition: not suspected or believed likely
Usage: remained unsuspected as the head of the spy ring; he was able to get into the building unspotted and unsuspected; unsuspected difficulties arose; unsuspected turnings in the road