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

Antonym: enlightening

• ballooning
• balloonist
• ballot
• ballot box
• Ballota
• Ballota nigra
• balloting
• ballottement
• ballpark
• ballpen
• ballplayer
• ballpoint
• ballpoint pen
• ballroom
• ballroom dance
• ballroom dancing
• ballroom music
• balls-up
• ballsy
• ballup
• bally
• ballyhoo
• ballyhoo artist
• ballyrag
• balm