• WordNet 3.6
    • adj unknown being or having an unknown or unnamed source "a poem by an unknown author","corporations responsible to nameless owners","an unnamed donor"
    • adj unknown not known before "used many strange words","saw many strange faces in the crowd","don't let anyone unknown into the house"
    • adj unknown not famous or acclaimed "an obscure family","unsung heroes of the war"
    • adj unknown not known "an unknown amount","an unknown island","an unknown writer","an unknown source"
    • adj unknown not known to exist "things obscurely felt surged up from unknown depths"
    • n unknown a variable whose values are solutions of an equation
    • n unknown an unknown and unexplored region "they came like angels out the unknown"
    • n unknown anyone who does not belong in the environment in which they are found
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: August 9, 1173 marked the first day of construction on the Leaning Tower of Pisa. It was completed sometime in 1370 after two building stoppages. In 1178, when the tower was three stories tall, construction was halted for unknown reasons. It wasn't until 1272 that construction resumed, and that lasted until 1278 (the tower was seven stories at that point). In 1360, construction of the belfry that would eventually hold seven bells began.
    • a Unknown Not known; not apprehended.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: Danishes are called Vienna cakes in Denmark, and Spanish rice is unknown in Spain.
    • unknown Not known; not become an object of knowledge; not recognized, discovered, or found out.
    • unknown Unknown in this sense is often used in the predicate, followed by to: as, a man unknown to fame; a fact unknown to the public. In this use it is also often used absolntely: as, unknown to me (elliptically for it being unknown to me), he made a new contract.
    • unknown Not ascertained, with relation to extent, degree, quantity, or the like; hence, incalculable; inexpressible; immense.
    • unknown Not to be made known, expressed, or communicated.
    • unknown Not having had sexual commerce.
    • n unknown One who or that which is unknown. An obscure individual; one without prestige.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: Studies show that, for some unknown reason, the higher the level of education, the more men tend to have wet dreams.
    • adj Unknown not known, mentally apprehended, recognised, or made know
    • ***


  • John Fowles
    John Fowles
    “Content is a word unknown to life; it is also a word unknown to man.”
  • Francis Picabia
    “The world is divided into two categories: failures and unknowns.”
  • Benjamin Franklin
    “There have been as great souls unknown to fame as any of the most famous.”
  • John Milton
    “Not to know me argues yourselves unknown.”
  • Corrie Ten Boom
    Corrie Ten Boom
    “Never be afraid to trust an unknown future to a known God.”
  • John Harrigan
    John Harrigan
    “Happiness held is the seed; Happiness shared is the flower-Author Unknown People need your love the most when they appear to deserve it the least.”


In literature:

By spirit we can understand only some unknown thing which is not body.
"Voltaire's Philosophical Dictionary" by Voltaire
On the evening of the sixth day out from Fort Boise we went into camp for the last time before entering the unknown land.
"In Search of the Unknown" by Robert W. Chambers
If so, was there also an unknown Southern Continent?
"Prince Henry the Navigator, the Hero of Portugal and of Modern Discovery, 1394-1460 A.D." by C. Raymond Beazley
The sexes mingled with a businesslike informality unknown in times of peace.
"Robin" by Frances Hodgson Burnett
Dr. Gillespie was the first dweller in that unknown world east of the Alleghenies whom David had met.
"The Emigrant Trail" by Geraldine Bonner
Stoves and chimneys, starvation and epidemics, are unknown.
"The Andes and the Amazon" by James Orton
The influence of the great forests, of the vast unknown spaces, was upon him.
"The Young Trailers" by Joseph A. Altsheler
And he knew that desire for a big verdict which often tortures the unknown creator.
"The Way of Ambition" by Robert Hichens
Their origin is unknown.
"A Smaller History of Rome" by William Smith and Eugene Lawrence
It would lead to the Spanish possessions, not to the unknown North.
"Vikings of the Pacific" by Agnes C. Laut

In poetry:

These are the woes of Slaves;
They glare from the abyss;
They cry, from unknown graves,
"We are the Witnesses!"
"The Witnesses" by Henry Wadsworth Longfellow
In bloom of youth and beauty,
But yesterday she shone;
And her fond parents thought her
A mine of wealth unknown.
"The Great Physician" by Mary Ann H T Bigelow
We seemed alone: but another
Bent o'er you with lips of flame,
Unknown, without a name,
Hated, and yet my brother.
"The Alien" by Aldous Huxley
She hath left me here alone
All alone, as unknown,
Who sometime did me lead with herself,
And me loved as her own.
"As ye came from the Holy Land" by Anonymous British
How shall I praise th' eternal God,
That infinite Unknown?
Who can ascend his high abode,
Or venture near his throne?
"Hymn 166" by Isaac Watts
She lived unknown, and few could know
When Lucy ceased to be;
But she is in her grave, and, oh,
The difference to me!
"Lucy " by William Wordsworth

In news:

The engineer these days is Clint "Choo Choo" Chelf, the third-stringer who has gone from practically unknown to cult hero in a matter of weeks.
Chemicals used on Gulf spill carry unknown risks, scientists say.
Cause of death of crewman unknown.
The cause of his death is yet unknown.
Details of his education are unknown.
A Democratically Evolving Hungary Heads Into Unknown at Polls Today.
Source of school illnesses unknown.
Drought Impact on Kentucky Agritourism Still Unknown.
In 1984, a relatively unknown Tim Burton created the 30-minute short "Frankenweenie".
Anthony Bourdain's new CNN show will be called Parts Unknown.
Angelea Preston was disqualified after shooting wrapped for an unknown reason.
Viral photo of Lindsey Stone at the Tomb of the Unknown Soldiers at Arlington National Cemetery, photo courtesy Facebook.
Chilies are a rich source of vitamin C, but it is unknown whether that played a role in their cultivation.
Previously unknown group says blasts in retaliation for Iraq, Afghanistan.
He's 50 years old, been through an unknown amount of surgeries, and was looking frail they're for a while.

In science:

The exact nature of this source remains unknown.
OH Zeeman Magnetic Field Detections Toward Five Supernova Remnants Using the VLA
G, and that the convergence rate of the chain on k-tuples to its stationary distribution is unknown.
Random matrix theory over finite fields: a survey
So, the three–point functions cannot be determined up to only constants; there remains unknown functions in them.
Two dimensional fractional supersymmetric conformal field theories and the two point functions
The maximum-likelihood principle states that the best estimation of unknown parameters is given by the values that are most likely to produce the data one experimenter has observed.
Characterising a universal cloning machine by maximum-likelihood estimation
One is conclusive for the outcomes of α ≤ d2 where we can achieve a perfect transfer of the unknown state.
Optimal conclusive teleportation of a d-dimensional unknown state