1. Failing to inform or clarify
   "an unenlightening comment"
   - unilluminating 
2. Not edifying
   - unedifying

Antonym: enlightening

• amazing
• amazingly
• amazon
• Amazon ant
• Amazon River
• Amazona
• Amazonian
• ambage
• ambages
• ambagious
• ambassador
• ambassadorial
• ambassadorship
• ambassadress
• amber
• amber lily
• amber-green
• amberbell
• Amberboa
• Amberboa moschata
• amberfish
• ambergris
• amberjack
• ambiance
• ambidexterity