1. Not anticipated
   "unanticipated and disconcerting lines of development"
   - unforeseen, unlooked-for, out of the blue

See also: unexpected

• piece of tail
• piece of work
• piece of writing
• piece-dye
• piecemeal
• piecewise
• piecework
• pieceworker
• pied
• pied lemming
• Pied Piper
• Pied Piper of Hamelin
• pied-billed grebe
• pied-à-terre
• piedmont
• Piedmont glacier
• Piedmont type of glacier
• Piemonte
• pieplant
• pier
• pier arch
• pier glass
• Pier Luigi Nervi
• pier mirror
• pier table