smart idiot

Someone who is smart in school, but is dumb in almost all real life situations.

being really really smart and not being able to do anything with it

The type of person that has book smarts yet lacks basic knowledge or common sense. A smart idiot is the type of person to ace a math test but not know how a can opener works, or the type of person to know the entire periodic table but pushes a pull door

The way of saying a funny sentence and being an idiot while you're throwing some knowledge there.

One who excells far ahead in school but is rather stupid in the sense that they are close minded and not tolerant of people different than themselves. They often see themselves as better than many other people and judge people solely on their academic achievements and not on their personality or moral values.

The opposite of this is a dumb genius. One who does not do well in school but is very street smart and if he put in effort would do well in school as well.

Daphne.
A person who is very book smart, but has little to no common sense