adjective. extremely unintelligent. If you need to see this in an example sentence, you are dumb as a box of rocks. Sorry but he’s dumber than a box of rocks. See more words with the same meaning: unintelligent, dumb.Click to see full answer. Correspondingly, what does a box of rocks mean?box of rocks. an unintelligent person. From dumb as a box of rocks. That girl is a box of rocks! See more words with the same meaning: unintelligent person, idiot.Secondly, what’s dumber than a rock? dumber-than-a-rock. Extremely dumb. Additionally, is dumber than a box of rocks? If you win – hooray! You’re NOT dumber than a box of rocks. If the rocks win (which happens more often than you’d think) – boo! Wear your shame for a minute, pick up the box and play again!Do rocks have an IQ?A rock has an IQ of 100. An IQ less than 100 means that person is behind that of an average person of that age. An IQ of 100 means that their age is the same as their mental age.

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