dull

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Related to as dull as dishwater: dull as ditchwater, dull as ditch water

dull

1. (of weather) not bright or clear; cloudy
2. (of colour) lacking brilliance or brightness; sombre
3. Med (of sound elicited by percussion, esp of the chest) not resonant
References in periodicals archive ?
TRANSFER deadline day was as dull as dishwater in Scotland but CSKA Sofia livened things up in Bulgaria by making a shock swoop for Michel Platini.
PRIME Minister Brown is dour, dreary and as dull as dishwater.
Particularly as I regard Shakespeare as being as dull as dishwater, and Mervyn does dull extremely effectively.