1. Incapable of being overcome, challenged or refuted
   - impregnable

See also: unconquerable

• fascination
• fascinator
• fascine
• Fasciola
• Fasciola hepatica
• fascioliasis
• Fasciolidae
• fasciolopsiasis
• Fasciolopsis
• Fasciolopsis buski
• fasciolosis
• fascism
• fascist
• fascista
• fascistic
• fash
• fashion
• fashion arbiter
• fashion business
• fashion consultant
• fashion designer
• value-added tax
• value-system
• valued
• valueless