Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.bertrand russell
A person is smart. People are dumb, panicky, dangerous animals and you know it.
Never attribute to malice that which is adequately explained by stupidity.Robert J. Hanlon
We are growing serious, and, let me tell you, that's the very next step to being dull.joseph addison
Think of how stupid the average person is, and then realize half of them are stupider than that.George carlin
I never heard tell of any clever man that came of entirely stupid people.thomas carlyle
I find we are growing serious, and then we are in great danger of being dull.william congreve
He is not only dull himself, but the cause of dullness in others.samuel johnson
Folly is as great as the sea. It can compass anything.
The bookful blockhead, ignorantly read, With loads of learned lumber in his head.Alexander Pope
Weapons-Grade Stupidity: Tech-support slang for customer intelligence that is so low it poses a severe hazard to those who come in contact with it.
When the world begets too many fools, nature provides a Foolkiller.
I'd all but given up my crusade to rid the world of fools…there are, I found, just too many!
La faute en est aux dieux, qui la firent si bête.
The impenetrable stupidity of Prince George (son-in-law of James II.) served his turn. It was his habit, when any news was told him, to exclaim, "Est il possible?" "Is it possible?"
Peter was dull; he was at first Dull, Oh, so dull so very dull! Whether he talked, wrote, or rehearsed Still with his dulness was he cursed Dull beyond all conception dull.Percy Bysshe Shelley
If you just heard about me then you're stupid late.G-Eazy
But the thing is, you mustn’t go doing anything stupid.J. K. Rowling
I'm fairly certain that YOLO is just Carpe Diem for stupid people.Jack Black
Don't talk out loud, you lower the IQ of the whole street.Sherlock Holmes
Isn't it rather dangerous to use one's entire vocabulary in a single sentence?francis