not very intelligent.

I could tell he was a few fries short of a Happy Meal, but unfortunately you can't arrest someone for being stupid.

Usage notes: this idiom appears in many different forms, including a few cards short of a full deck, a few bricks short of a full load, a few clowns short of a circus, and a few Cokes short of a six-pack, all with the same meaning

• put head down
• put head on the block
• put heads together
• put heart and soul into
• put heart and soul into doing something
• put heart and soul into something
• put heart into
• put heart into something
• put house in order
• put ideas into head
• put ideas into someone's head
• put in a good word
• put in a good word for
• put in a good word for someone
• put in a hole
• put in in two penn'orth
• put in in your two penn'orth
• put in mind of
• put in mind of someone
• put in mind of something
• put in motion
• put in place
• put in someone's place
• put in their place
• put in the picture