1. In an obvious and provable manner
   "his documentary sources are demonstrably wrong"
   - provably, incontrovertibly, irrefutably

See also: demonstrable

• Director of Central Intelligence
• director of research
• director-general
• director-stockholder relation
• directorate
• Directorate for Inter-Services Intelligence
• directorial
• directorship
• directory
• directress
• directrix
• direful
• direfully
• direly
• diremption
• dirge
• dirham
• dirigible
• dirigisme
• dirigiste
• diriment impediment
• dirk
• dirndl
• dirt
• dirt ball