Related Clues:

• Word before job or tube
• Mental halfwit
• Palindromic doofus
• One isn't sharp
• ___ tube (TV set)
• Unlikely Mensa candidate
• __ tube
• *Doofus
• "Dumb & Dumber" type
• Dim bulb
• He's not a Mensa candidate
• Dim-bulbed sort
• Definitely no genius
• Dunce-cap candidate
• One who isn't quick