numpty
Noun
Meaning
numpty (plural numpties)
(Britain, derogatory) An idiot, dolt or fool.
Synonyms
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No different to the corporate world where you can have the best firewalls and IPS in the world but if some numpty admin responds to a phishing email with their uid and password you’re screwed.
That's not a sentence from the novel you numpty I said, that sounds more like the title of the book!