dull as dishwater

• dull as ditchwater

Modified from dull as ditchwater (1700s) in the first half of the 1900s, perhaps through mispronunciation.^[1]

• Audio (General Australian):

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dull as dishwater (not comparable)

1. (simile) Boring; ordinary; exceedingly dull.

   Synonym: boring as beans

   • 1932, Delos W. Lovelace, King Kong, published 1965, page 6:

     ‘My blessed Public must have a pretty girl’s face. Romance isn’t romance, adventure is as dull as dishwater...to my Public...unless, every so often, a face to sink a thousand ships, or is it saps? shows up.’

• watch paint dry
• bored to tears