There's another word with too broad a meaning. Depending on the context and the speaker, clever can be the opposite of genuinely low IQ but also of foolish, naive and more. Johnson is sometimes foolish and has more often let his ego rush ahead of his intellect, but one thing he isn't is "fucking thick". In this particular case, he's being a shameless, bare-faced liar but he knows what he's doing.
For sure, but he's a very specific version of all of these words in a specific way. His opinion of himself is certainly overinflated whatever and above all, he's a massive cunt.
There's another word with too broad a meaning. Depending on the context and the speaker, clever can be the opposite of genuinely low IQ but also of foolish, naive and more. Johnson is sometimes foolish and has more often let his ego rush ahead of his intellect, but one thing he isn't is "fucking thick". In this particular case, he's being a shameless, bare-faced liar but he knows what he's doing.