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 ?
Apart from one or two, their Christmas Day programmes were as dull as dishwater.
No chance of that because he's as dull as dishwater.
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.