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stupid or slow-witted; adjective - (Oxford English Dictionary definition) also describes one who is lacking in composure, grace, intellect, style etc.

A nick-name for one whose attributes are all of the above.
Tom: That guy is SO gormless, he really doesn't have a clue! It's actually hilarious to watch... from a distance.
Dick: Yeah, I really cant stand that guy! I'd NEVER invite him to a party.
Harry: Guys, chill, it can't be easy to wake up every morning and have to face not only the world but also yourself. Have some compassion for the dude; he's clearly got problems.

Brian: Sometimes I just feel so, so, SO gormless!
Briana: Hmm, 'gormless', rhymes with formless, chormless, hormless...
Brian: That's not helpful.
Briana: Perhaps if you thought about your words before you spoke them... hmm? After all, the definition of a gentleman IS 'one who says what they mean and means what they say'!

"The man gormlessly(<-adverb) spent his life with his proverbial foot in his mouth; always the moment killer, cringe worthy comment maker, lie starter and shit stirrer. He had made many enemies out of friends and had a lot to atone for."
by whiteymcfitey January 04, 2009
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3
A dozy, vacant expression.
Oblivious to ones surroundings, mouth agape.
"Wake up you gormless twat!"
by coreyhaim May 05, 2005
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Definition:

1. A lack of intelligence, or a person or thing of less, or fewer, intelligence.
2. Less than intelligent.

Related form:
gorm + less - adjective

gorm
- noun. intelligence, intelligent

less (Ref: www.dictionary.com)
–noun 7. a smaller amount or quantity...
–adjective. smaller in size...
The existing definitions of 'gorm' define the word gormless.
by gmanyyz July 11, 2009
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7
based on Roald Dahl's Matilda: people who aren't dull or stupid, but arrogant and narcissistic
well if look at the current British slang definition of gormless, it certainly wouldn't describe Matilda's parents in Roald Dahl's book, so I'd say gormless should have a new and improved meaning
by sexydimma May 24, 2016
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