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Used when a smart person is momentarily dumb or forgetful. Pronounced(oondum)
You are such an undumb!
Undumb by !Unicornlover3402789 January 15, 2020
Related Words

uncumberbatchable 

Being so extremely unpopular and/or dislikable that even Benedict Cumberbatch could not make you a likable character in a movie.
Julien Assange is not a likeable man. Even Benedict Cumberbatch could not make him likeable. He is Uncumberbatchable.
uncumberbatchable by MBobbie March 31, 2018
To undo the effect of dubbed voices by restoring those used in the original language. Usually used in the context of video game modification.

This word may be used as a verb (process) or noun (product).
I played the undub version of that game because the english voices were terrible.
undub by just a traveller March 19, 2008
A word to describe someone who is dumber than a dumbdumb, as they don't have enough intelligence to add a 'd' or 'b'.
"That guy is such a dumbdumb."
"No! He's a umdumb!"
Umdumb by confinedtragedy September 8, 2007

unhumble opinion 

lily w.s, because all her ideas are relevant. because she is the best. god complex.
unhumble opinion by nashinoodle October 19, 2021
Noun: 1. A person who uses UD posts for personal vengence, not realizing it makes them look pitiful. 2. A person who posts their own name on UD, not realizing it makes them look like someone you want to avoid at all costs.
That UDumber put the name of the girl who dumped him on. Has he lost his mind?
UDumber by magill March 22, 2008