Synonyms for Unannounced:

adj.

all (adjective)
unheralded, unpredicted.
not disclosed (adjective)
unheralded.
unheralded (adjective)
unpredicted.

n.

sensational, astonishing, earth-shattering, extraordinary, staggering, amazing, surprising, phenomenal, remarkable. unannounced (noun)
unheralded, unexpected, unpredicted.

Other synonyms:

Other relevant words:
sensational, astonishing, earth-shattering, extraordinary, staggering, amazing, surprising, phenomenal, remarkable.

Usage examples for unannounced

  1. He had been inclined to be very angry with him for his long and unannounced absence from the office. – The Claverings by Anthony Trollope
  2. I came to ask you to go to my mother to prepare her for this- I dared not shock her by going unannounced – Flamsted quarries by Mary E. Waller
  3. Then passing through seven courts, beautiful as the Paradise of Indra, they entered, unannounced as became the priestly dignity, a hall where, surrounded by his courtiers, sat the ruler. – Vikram-and-the-Vampire-Classic-Hindu-Tales-of-Adventure-Magic-and-Romance by Burton, Isabel, Lady