dull

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Related to as dull as dishwater: dull as ditchwater, dull as ditch water
References in periodicals archive ?
Now that she's starring in a self-penned movie comedy, ``Dirty Love,'' it's clear that McCarthy's wit is as dull as dishwater blond, even when fully unleashed.
A) Well I think EastEnders is as dull as dishwater, I'm not really into things like that I suppose.
Get real, Martina, women's tennis needs a bit of glamour or it would be as dull as dishwater.