• A few clowns short of a circus.
• A few fries short of a Happy Meal.
• An experiment in Artificial Stupidity.
• A few beers short of a six-pack.
• Dumber than a box of hair.
• A few peas short of a casserole.
• Doesn't have all his cornflakes in one box.
• The wheel's spinning, but the hamster's dead.
• One Fruit Loop shy of a full bowl.
• One taco short of a combination plate.
• A few feathers short of a whole duck.
• All foam, no beer.
• The cheese slid off his cracker.
• Body by Fisher, brains by Mattel.
• Has an IQ of 2, but it takes 3 to grunt.
• Warning: Objects in mirror are dumber than they appear.
• Couldn't pour water out of a boot with instructions on the heel.
• He fell out of the Stupid tree and hit every branch on the way down.
• An intellect rivaled only by garden tools.
• As smart as bait.
• Chimney's clogged.
• Doesn't have all his dogs on one leash.
• Doesn't know much but leads the league in nostril hair.
• Elevator doesn't go all the way to the top floor.
• Forgot to pay his brain bill.
• Her sewing machine's out of thread.
• His antenna doesn't pick up all the channels.
• His belt doesn't go through all the loops.
• If he had another brain, it would be lonely.
• Missing a few buttons on his remote control.
• No grain in the silo.
• Proof that evolution CAN go in reverse.
• Receiver is off the hook.
• Several nuts short of a full pouch.
• Skylight leaks a little.
• Slinky's kinked.
• Surfing in Nebraska.
• Too much yardage between the goal posts.
• In the pinball game of life, his flippers were a little further apart than most.
• The lights are on, but nobody's home.
• A little light in the loafers.
• Hasn't got both oars in the water.
• A few bricks short of a load.
• Not the brightest light in the harbor.
• Not the sharpest knife in the drawer. (Contributed by Purrangels.)
• Not the brightest crayon in the box. (from Dennis C.)
• She's so bright she shines. (from mindylee)
• Dumber than a rock in a box. (from PhoneGrrl21)
• Sharp as a doorknob. (from PhoneGrrl21)
• Not the sharpest tool in the shed. (from WTWcap)
• Not the funnest ride in the park. (from WTWcap)
• He is depriving some village of an idiot. (from Lee Running)
• Sharp as a bowling pin. (from SBY4PLUS1)
• 9 cents short of a dime. (from TwinkieVHS69)

Know any other ways to say someone is Stupid?
Email me and I'll add them to the list