1. Impossible to achieve
   "an unattainable goal"
   - unachievable, undoable, unrealizable, unrealisable [Brit]

See also: impossible, unattainableness

• forestry
• foreswear
• foretaste
• foretell
• foretelling
• forethought
• forethoughtful
• foretoken
• foretop
• forever
• forever and a day
• forevermore
• forewarn
• forewarning
• forewing
• forewoman
• foreword
• forex
• foreyard
• forfeit
• forfeited
• forfeiture
• forfend
• forficate
• Forficula