1. Without warning or announcement
   "a totally unheralded telegram that his daughter...died last night"
   - unannounced, unpredicted

See also: unexpected

• unmoved
• unmoving
• unmown
• unmuffle
• unmusical
• unmusically
• unmutilated
• unmuzzle
• unmyelinated
• unnameable
• unnamed
• unnatural
• unnaturalised
• unnaturalized
• unnaturally
• unnaturalness
• unnavigable
• unnecessarily
• unnecessary
• unneeded
• unneighborliness
• unneighborly
• unneighbourliness
• unneighbourly
• unnerve