The best replacement for unknown is not known.

The best alternatives to unknown are rated as following:
★★★★★  not known
★★★★  unbeknownst
★★★  taken
★★★  private number
★★  private caller
★★  blocked
★★  bourne identity
★  enemy within
★  aventon
★  no reservations
★  max romeo
★  no caller id
★  unknown
  unbeknown
  xcom
  barry white

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unknown
not known
unbeknownst