1. Very uncertain
   "left everything up in the air" 
2. Not yet determined
   "plans are still up in the air"

See also: uncertain

• food color
• food coloring
• food colour
• food colouring
• food company
• food court
• food cycle
• food elevator
• food faddist
• food fish
• food for thought
• food grain
• food hamper
• food manufacturer
• food market
• food miles
• food poisoning
• food processor
• food product
• food pyramid
• food shop
• food stamp
• food turner
• food waste
• food web