unforeseen
1. [ adjective ] not anticipated
Synonyms: out_of_the_blue unlooked-for unanticipated
Examples:

"unanticipated and disconcerting lines of development"- H.W.Glidden "unforeseen circumstances" "a virtue unlooked-for in people so full of energy" "like a bolt out of the blue"

Related terms: unexpected
2. [ adjective ] happening or coming quickly and without warning
Synonyms: unexpected
Examples:

"a sudden unexpected development"

Related terms: sudden
Similar spelling:   unforeseeable
  unfreeze
  unpressed
  unpresentable
  unprecedented
  uniformise
  unforsaken
  unforested
  uniformness
  unformed
  unforced
  unpretending
  unperformed
  unfrequented
  unpreventable
  unpretentious
  unpowered
  uniformed
  unforbearing
  unforceful