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

See also: uncertain

• François Rene Chateaubriand
• François Truffaut
• François Villon
• François-Marie Arouet
• Françoise d'Aubigne
• Françoise-Athenais de Rochechouart
• frap
• frappé
• Fraser fir
• Frasera
• Frasera speciosa
• frat
• frat house
• Fratercula
• Fratercula arctica
• Fratercula corniculata
• fraternal
• fraternal twin
• fraternally
• fraternisation
• fraternise
• fraterniser
• fraternity
• fraternity house
• fraternization