dull as dishwater

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(as) dull as dishwater

Very boring or unexciting. This phrase is often used to describe a person. My date with Dave was not great—he is as dull as dishwater. I fell asleep during that movie because it was as dull as dishwater. That lady is nice enough, but she's just dull as dishwater. Like, I didn't need a 10 minute recap about how she almost lost her keys this morning.
See also: dishwater, dull
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

*dull as dishwater

 and *dull as ditch water
very uninteresting. (*Also: as ~.) I'm not surprised that he can't find a partner. He's as dull as dishwater. Mr. Black's speech was as dull as dishwater.
See also: dishwater, dull
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

dull as dishwater

Boring, tedious, as in That lecture was dull as dishwater. The original simile, dull as ditchwater, dating from the 1700s, alluded to the muddy water in roadside ditches. In the first half of the 1900s, perhaps through mispronunciation, it became dishwater, that is, the dingy, grayish water in which dirty dishes had soaked.
See also: dishwater, dull
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

dull as dishwater (or ditchwater)

extremely dull.
See also: dishwater, dull
Farlex Partner Idioms Dictionary © Farlex 2017

dull as dishwater

See also: dishwater, dull
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

dull as dishwater

Flat, boring. This expression began life in the eighteenth century as dull as ditchwater, alluding to the muddy color of the water in roadside gullies. “He’d be sharper than a serpent’s tooth, if he wasn’t as dull as ditchwater,” says Dickens’s Fanny Cleaver (Oliver Twist). This version survived on both sides of the Atlantic well into the twentieth century. Either through careless pronunciation or through similar analogy it occasionally became dishwater—water in which dishes had been washed and which consequently was dingy and grayish.
See also: dishwater, dull
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
But now it is dull as dishwater, so uber cool resident Nick Grimshaw is planning to pack up his vintage bags and move East.
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It's as dull as dishwater and is not even worthy of background music status.
Unlike the rest of the dull as dishwater cast she's mischievous, cheeky and a complete stunner.
The sex is still great but everything else is dull as dishwater. What should I do?