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

See also: unconquerable

• Blaia Zimondal
• blain
• Blair
• Blairite
• Blaise Pascal
• Blake
• blamable
• blame
• blame game
• blameable
• blamed
• blameful
• blameless
• blamelessly
• blamelessness
• blameworthiness
• blameworthy
• blanc
• blanc fixe
• blanch
• blanched
• blanching agent
• blancmange
• bland
• bland diet