It's a little old but how about, "The lights are on, but nobody's home."
When I really want to be subtle (joke) I say, "He/she is dumber than a brick."
Or, "If his IQ was 3 points lower, he'd be a plant."
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Fraternally,
DeltAlum
DTD
The above is the opinion of the poster which may or may not be based in known facts and does not necessarily reflect the views of Delta Tau Delta or Greek Chat -- but it might.
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