unknown

Definition

Examples

The cause of the power failure is still unknown.

Synonyms

• unfamiliarnot known or well known
• unidentifiednot yet identified
• undiscoverednot discovered

Collocations

• Easy unknown caller
  describing unknown caller (an unknown and unexplored region)
• Medium cause of the outage is unknown
  to cause of the outage is unknown, meaning to give rise to; cause to happen or occur, not always intentionally
• Hard venturing into unknown economic waters
  to venturing into unknown economic waters, meaning to proceed somewhere despite the risk of possible dangers
• Very Hard step into the great unknown with steadfast resolve
  to step into the great unknown with steadfast resolve, meaning to shift or move by taking a step