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| dumb as a fish; as dumb as a fish | |||
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| dumb as a doorknob (Баян; Not an error, but I've also heard of "as a sack of hair" and "as a box of rocks (in the rain)." Liv Bliss) | |||
| not the sharpest tool in the shed (Ballistic) | |||
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| in his/her head, there's nobody home (He might be the nicest person in the neibourhood but in his head, there’s nobody home.) | |||