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
A person, male or female, whose intellect is sub-par. They say and do things that make you scratch your head. They have the tendency to either drool and/or accumulate that white stuff at the corners of their mouth. They tend to be slovenly people with no sense of style and their bodies tend to look asexual.
1. "Fuck me, look at that gormless bastard, what is that?"
2. "Is that a boy or a girl?"
3. "Are those tits or man tits?"
4. "I wouldn't fuck that gormless bitch with a ten foot bargepole"