1. Used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value
   - inconvertible, unexchangeable

See also: convertibility, irredeemable

• unfeathered
• unfed
• unfeeling
• unfeelingly
• unfeelingness
• unfeigned
• unfeignedly
• unfeminine
• unfenced
• unfermented
• unfertile
• unfertilised
• unfertilized
• unfetter
• unfettered
• unfilial
• unfilled
• unfilmed
• unfinished
• unfinished business
• unfirm
• unfit
• unfitness
• unfitting
• unfix