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'unknown' in a sentence

Learn how to use 'unknown' with 18 example sentences.


unknown adjective

: not known

: being or having an unknown or unnamed source

: not known to exist

: not famous or acclaimed

: not known before

unknown noun

: an unknown and unexplored region

: anyone who does not belong in the environment in which they are found

: a variable whose values are solutions of an equation


  • The exact date of Jesus' birth is unknown.
  • The number of casualties is still unknown.
  • The cause of the fire is yet unknown.
  • Details of the attack are still unknown.
  • The origin of this word is unknown.
  • The builder of those houses is unknown.
  • An unknown number of victims may be trapped beneath the rubble.
  • The whereabouts of the suspect is still unknown.
  • A known mistake is better than an unknown truth.
  • He's a star in Germany, but completely unknown in America.
  • The genome of this virus is unknown.
  • The reason she killed herself is unknown.
  • So much is still unknown about lighting.
  • The only thing that remains unknown to man is man himself.
  • Fear comes from the unknown.
  • Smallpox was unknown to Native Americans.
  • The enemy cavalry crossed the river by an unknown ford.
  • Dan was seen talking to an unknown man near the restaurant.
  • Words related to 'unknown'


    Words near 'unknown' in the dictionary