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

See also: unexpected

• steam organ
• steam pipe
• steam room
• steam shovel
• steam turbine
• steam whistle
• steam-heat
• steam-powered
• steamboat
• steamed
• steamed pudding
• steamer
• steamer clam
• steamfitter
• steaminess
• steaming
• steamroll
• steamroller
• sea scooter
• sea scorpion
• Sea Scout
• sea serpent
• sea shanty
• sea slater
• sea slug