know it all, n.All

A Know-it-all is one who knows everything, except how to keep others from thinking him a fool.

A Know-it-all is one who seldom meets his intellectual equal, and never his superior.

My wife said she’s had it with my ‘Mr. know-it-all’ attitude.I told her I was pretty sure she'd say that

A Know-it-all is one who knows more about everything than you know about anything.

A Know-it-all is a man whose wide range of information is always bas'ed on a narrow acquaintance with facts.

A Know-it-all is one who knows the answer even before he understands the question.

A Know-it-all is one who doesn't recognize their betters because they don't acknowledge that they exist.

A Know-it-all is a man who never opens his mouth without subtracting from the sum of human knowledge.

The Know-it-all is one who doesn't know enough to conceal what he doesn't know.