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

See also: unexpected

• stone breaker
• stone crab
• stone curlew
• stone drill
• stone facing
• stone fruit
• stone life face
• stone marten
• stone mimicry plant
• stone parsley
• stone pine
• stone pit
• stone plant
• stone's throw
• stone-blind
• stone-broke
• stone-cold
• stone-dead
• stone-deaf
• stone-gray
• stone-grey
• stone-sober
• stonechat
• stonecress
• stonecrop