Meaning of the word "(as) dull as dishwater" in English

What does "(as) dull as dishwater" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

(as) dull as dishwater

US /əz dʌl əz ˈdɪʃˌwɔtər/
UK /əz dʌl əz ˈdɪʃˌwɔtər/
"(as) dull as dishwater" picture

Idiom

very boring or uninteresting

Example:
The movie was as dull as dishwater, I almost fell asleep.
His presentation was as dull as dishwater, full of facts but no passion.
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