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Discover LudwigThe phrase "dumb of" is not a commonly used phrase in written English and is not considered grammatically correct.
It is likely a regional slang or colloquialism. Example: "It was dumb of him to forget his keys." This sentence is using "dumb" as an adjective to describe the person's action of forgetting their keys. However, a more grammatically correct way to phrase this would be "It was foolish of him to forget his keys."
Exact(17)
That was dumb of me".
I play dumb, of course — what else can I do?
It was dumb of our ancestors to jettison thou".
"It was really dumb of him," said Mrs. Cohen, a retired hairdresser and mother of two.
Mr. Ozersky has since appended a clarification to the column, writing that "it was dumb of me not to be more explicit".
It was clever of Tim Robbins to make "Cradle Will Rock," and dumb of everyone else not to have made it before.
Similar(43)
AMERICAPEDIA Taking the Dumb Out of Freedom.
I felt dumb, out of it.
People acting dumb out of fear or ignorance can be forgiven.
In 2010, The Daily Beast named it the dumbest of the 55 largest cities in America.
The buzz: "They're the most interesting shoegaze band in the world right now" – the Dumbing of America.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com